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1 <?php 2 3 /** 4 * PHPMailer RFC821 SMTP email transport class. 5 * PHP Version 5.5. 6 * 7 * @see https://github.com/PHPMailer/PHPMailer/ The PHPMailer GitHub project 8 * 9 * @author Marcus Bointon (Synchro/coolbru) <phpmailer@synchromedia.co.uk> 10 * @author Jim Jagielski (jimjag) <jimjag@gmail.com> 11 * @author Andy Prevost (codeworxtech) <codeworxtech@users.sourceforge.net> 12 * @author Brent R. Matzelle (original founder) 13 * @copyright 2012 - 2020 Marcus Bointon 14 * @copyright 2010 - 2012 Jim Jagielski 15 * @copyright 2004 - 2009 Andy Prevost 16 * @license https://www.gnu.org/licenses/old-licenses/lgpl-2.1.html GNU Lesser General Public License 17 * @note This program is distributed in the hope that it will be useful - WITHOUT 18 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 19 * FITNESS FOR A PARTICULAR PURPOSE. 20 */ 21 22 namespace PHPMailer\PHPMailer; 23 24 /** 25 * PHPMailer RFC821 SMTP email transport class. 26 * Implements RFC 821 SMTP commands and provides some utility methods for sending mail to an SMTP server. 27 * 28 * @author Chris Ryan 29 * @author Marcus Bointon <phpmailer@synchromedia.co.uk> 30 */ 31 class SMTP 32 { 33 /** 34 * The PHPMailer SMTP version number. 35 * 36 * @var string 37 */ 38 const VERSION = '6.10.0'; 39 40 /** 41 * SMTP line break constant. 42 * 43 * @var string 44 */ 45 const LE = "\r\n"; 46 47 /** 48 * The SMTP port to use if one is not specified. 49 * 50 * @var int 51 */ 52 const DEFAULT_PORT = 25; 53 54 /** 55 * The SMTPs port to use if one is not specified. 56 * 57 * @var int 58 */ 59 const DEFAULT_SECURE_PORT = 465; 60 61 /** 62 * The maximum line length allowed by RFC 5321 section 4.5.3.1.6, 63 * *excluding* a trailing CRLF break. 64 * 65 * @see https://www.rfc-editor.org/rfc/rfc5321#section-4.5.3.1.6 66 * 67 * @var int 68 */ 69 const MAX_LINE_LENGTH = 998; 70 71 /** 72 * The maximum line length allowed for replies in RFC 5321 section 4.5.3.1.5, 73 * *including* a trailing CRLF line break. 74 * 75 * @see https://www.rfc-editor.org/rfc/rfc5321#section-4.5.3.1.5 76 * 77 * @var int 78 */ 79 const MAX_REPLY_LENGTH = 512; 80 81 /** 82 * Debug level for no output. 83 * 84 * @var int 85 */ 86 const DEBUG_OFF = 0; 87 88 /** 89 * Debug level to show client -> server messages. 90 * 91 * @var int 92 */ 93 const DEBUG_CLIENT = 1; 94 95 /** 96 * Debug level to show client -> server and server -> client messages. 97 * 98 * @var int 99 */ 100 const DEBUG_SERVER = 2; 101 102 /** 103 * Debug level to show connection status, client -> server and server -> client messages. 104 * 105 * @var int 106 */ 107 const DEBUG_CONNECTION = 3; 108 109 /** 110 * Debug level to show all messages. 111 * 112 * @var int 113 */ 114 const DEBUG_LOWLEVEL = 4; 115 116 /** 117 * Debug output level. 118 * Options: 119 * * self::DEBUG_OFF (`0`) No debug output, default 120 * * self::DEBUG_CLIENT (`1`) Client commands 121 * * self::DEBUG_SERVER (`2`) Client commands and server responses 122 * * self::DEBUG_CONNECTION (`3`) As DEBUG_SERVER plus connection status 123 * * self::DEBUG_LOWLEVEL (`4`) Low-level data output, all messages. 124 * 125 * @var int 126 */ 127 public $do_debug = self::DEBUG_OFF; 128 129 /** 130 * How to handle debug output. 131 * Options: 132 * * `echo` Output plain-text as-is, appropriate for CLI 133 * * `html` Output escaped, line breaks converted to `<br>`, appropriate for browser output 134 * * `error_log` Output to error log as configured in php.ini 135 * Alternatively, you can provide a callable expecting two params: a message string and the debug level: 136 * 137 * ```php 138 * $smtp->Debugoutput = function($str, $level) {echo "debug level $level; message: $str";}; 139 * ``` 140 * 141 * Alternatively, you can pass in an instance of a PSR-3 compatible logger, though only `debug` 142 * level output is used: 143 * 144 * ```php 145 * $mail->Debugoutput = new myPsr3Logger; 146 * ``` 147 * 148 * @var string|callable|\Psr\Log\LoggerInterface 149 */ 150 public $Debugoutput = 'echo'; 151 152 /** 153 * Whether to use VERP. 154 * 155 * @see https://en.wikipedia.org/wiki/Variable_envelope_return_path 156 * @see https://www.postfix.org/VERP_README.html Info on VERP 157 * 158 * @var bool 159 */ 160 public $do_verp = false; 161 162 /** 163 * Whether to use SMTPUTF8. 164 * 165 * @see https://www.rfc-editor.org/rfc/rfc6531 166 * 167 * @var bool 168 */ 169 public $do_smtputf8 = false; 170 171 /** 172 * The timeout value for connection, in seconds. 173 * Default of 5 minutes (300sec) is from RFC2821 section 4.5.3.2. 174 * This needs to be quite high to function correctly with hosts using greetdelay as an anti-spam measure. 175 * 176 * @see https://www.rfc-editor.org/rfc/rfc2821#section-4.5.3.2 177 * 178 * @var int 179 */ 180 public $Timeout = 300; 181 182 /** 183 * How long to wait for commands to complete, in seconds. 184 * Default of 5 minutes (300sec) is from RFC2821 section 4.5.3.2. 185 * 186 * @var int 187 */ 188 public $Timelimit = 300; 189 190 /** 191 * Patterns to extract an SMTP transaction id from reply to a DATA command. 192 * The first capture group in each regex will be used as the ID. 193 * MS ESMTP returns the message ID, which may not be correct for internal tracking. 194 * 195 * @var string[] 196 */ 197 protected $smtp_transaction_id_patterns = [ 198 'exim' => '/[\d]{3} OK id=(.*)/', 199 'sendmail' => '/[\d]{3} 2\.0\.0 (.*) Message/', 200 'postfix' => '/[\d]{3} 2\.0\.0 Ok: queued as (.*)/', 201 'Microsoft_ESMTP' => '/[0-9]{3} 2\.[\d]\.0 (.*)@(?:.*) Queued mail for delivery/', 202 'Amazon_SES' => '/[\d]{3} Ok (.*)/', 203 'SendGrid' => '/[\d]{3} Ok: queued as (.*)/', 204 'CampaignMonitor' => '/[\d]{3} 2\.0\.0 OK:([a-zA-Z\d]{48})/', 205 'Haraka' => '/[\d]{3} Message Queued \((.*)\)/', 206 'ZoneMTA' => '/[\d]{3} Message queued as (.*)/', 207 'Mailjet' => '/[\d]{3} OK queued as (.*)/', 208 ]; 209 210 /** 211 * Allowed SMTP XCLIENT attributes. 212 * Must be allowed by the SMTP server. EHLO response is not checked. 213 * 214 * @see https://www.postfix.org/XCLIENT_README.html 215 * 216 * @var array 217 */ 218 public static $xclient_allowed_attributes = [ 219 'NAME', 'ADDR', 'PORT', 'PROTO', 'HELO', 'LOGIN', 'DESTADDR', 'DESTPORT' 220 ]; 221 222 /** 223 * The last transaction ID issued in response to a DATA command, 224 * if one was detected. 225 * 226 * @var string|bool|null 227 */ 228 protected $last_smtp_transaction_id; 229 230 /** 231 * The socket for the server connection. 232 * 233 * @var ?resource 234 */ 235 protected $smtp_conn; 236 237 /** 238 * Error information, if any, for the last SMTP command. 239 * 240 * @var array 241 */ 242 protected $error = [ 243 'error' => '', 244 'detail' => '', 245 'smtp_code' => '', 246 'smtp_code_ex' => '', 247 ]; 248 249 /** 250 * The reply the server sent to us for HELO. 251 * If null, no HELO string has yet been received. 252 * 253 * @var string|null 254 */ 255 protected $helo_rply; 256 257 /** 258 * The set of SMTP extensions sent in reply to EHLO command. 259 * Indexes of the array are extension names. 260 * Value at index 'HELO' or 'EHLO' (according to command that was sent) 261 * represents the server name. In case of HELO it is the only element of the array. 262 * Other values can be boolean TRUE or an array containing extension options. 263 * If null, no HELO/EHLO string has yet been received. 264 * 265 * @var array|null 266 */ 267 protected $server_caps; 268 269 /** 270 * The most recent reply received from the server. 271 * 272 * @var string 273 */ 274 protected $last_reply = ''; 275 276 /** 277 * Output debugging info via a user-selected method. 278 * 279 * @param string $str Debug string to output 280 * @param int $level The debug level of this message; see DEBUG_* constants 281 * 282 * @see SMTP::$Debugoutput 283 * @see SMTP::$do_debug 284 */ 285 protected function edebug($str, $level = 0) 286 { 287 if ($level > $this->do_debug) { 288 return; 289 } 290 //Is this a PSR-3 logger? 291 if ($this->Debugoutput instanceof \Psr\Log\LoggerInterface) { 292 //Remove trailing line breaks potentially added by calls to SMTP::client_send() 293 $this->Debugoutput->debug(rtrim($str, "\r\n")); 294 295 return; 296 } 297 //Avoid clash with built-in function names 298 if (is_callable($this->Debugoutput) && !in_array($this->Debugoutput, ['error_log', 'html', 'echo'])) { 299 call_user_func($this->Debugoutput, $str, $level); 300 301 return; 302 } 303 switch ($this->Debugoutput) { 304 case 'error_log': 305 //Don't output, just log 306 /** @noinspection ForgottenDebugOutputInspection */ 307 error_log($str); 308 break; 309 case 'html': 310 //Cleans up output a bit for a better looking, HTML-safe output 311 echo gmdate('Y-m-d H:i:s'), ' ', htmlentities( 312 preg_replace('/[\r\n]+/', '', $str), 313 ENT_QUOTES, 314 'UTF-8' 315 ), "<br>\n"; 316 break; 317 case 'echo': 318 default: 319 //Normalize line breaks 320 $str = preg_replace('/\r\n|\r/m', "\n", $str); 321 echo gmdate('Y-m-d H:i:s'), 322 "\t", 323 //Trim trailing space 324 trim( 325 //Indent for readability, except for trailing break 326 str_replace( 327 "\n", 328 "\n \t ", 329 trim($str) 330 ) 331 ), 332 "\n"; 333 } 334 } 335 336 /** 337 * Connect to an SMTP server. 338 * 339 * @param string $host SMTP server IP or host name 340 * @param int $port The port number to connect to 341 * @param int $timeout How long to wait for the connection to open 342 * @param array $options An array of options for stream_context_create() 343 * 344 * @return bool 345 */ 346 public function connect($host, $port = null, $timeout = 30, $options = []) 347 { 348 //Clear errors to avoid confusion 349 $this->setError(''); 350 //Make sure we are __not__ connected 351 if ($this->connected()) { 352 //Already connected, generate error 353 $this->setError('Already connected to a server'); 354 355 return false; 356 } 357 if (empty($port)) { 358 $port = self::DEFAULT_PORT; 359 } 360 //Connect to the SMTP server 361 $this->edebug( 362 "Connection: opening to $host:$port, timeout=$timeout, options=" . 363 (count($options) > 0 ? var_export($options, true) : 'array()'), 364 self::DEBUG_CONNECTION 365 ); 366 367 $this->smtp_conn = $this->getSMTPConnection($host, $port, $timeout, $options); 368 369 if ($this->smtp_conn === false) { 370 //Error info already set inside `getSMTPConnection()` 371 return false; 372 } 373 374 $this->edebug('Connection: opened', self::DEBUG_CONNECTION); 375 376 //Get any announcement 377 $this->last_reply = $this->get_lines(); 378 $this->edebug('SERVER -> CLIENT: ' . $this->last_reply, self::DEBUG_SERVER); 379 $responseCode = (int)substr($this->last_reply, 0, 3); 380 if ($responseCode === 220) { 381 return true; 382 } 383 //Anything other than a 220 response means something went wrong 384 //RFC 5321 says the server will wait for us to send a QUIT in response to a 554 error 385 //https://www.rfc-editor.org/rfc/rfc5321#section-3.1 386 if ($responseCode === 554) { 387 $this->quit(); 388 } 389 //This will handle 421 responses which may not wait for a QUIT (e.g. if the server is being shut down) 390 $this->edebug('Connection: closing due to error', self::DEBUG_CONNECTION); 391 $this->close(); 392 return false; 393 } 394 395 /** 396 * Create connection to the SMTP server. 397 * 398 * @param string $host SMTP server IP or host name 399 * @param int $port The port number to connect to 400 * @param int $timeout How long to wait for the connection to open 401 * @param array $options An array of options for stream_context_create() 402 * 403 * @return false|resource 404 */ 405 protected function getSMTPConnection($host, $port = null, $timeout = 30, $options = []) 406 { 407 static $streamok; 408 //This is enabled by default since 5.0.0 but some providers disable it 409 //Check this once and cache the result 410 if (null === $streamok) { 411 $streamok = function_exists('stream_socket_client'); 412 } 413 414 $errno = 0; 415 $errstr = ''; 416 if ($streamok) { 417 $socket_context = stream_context_create($options); 418 set_error_handler(function () { 419 call_user_func_array([$this, 'errorHandler'], func_get_args()); 420 }); 421 $connection = stream_socket_client( 422 $host . ':' . $port, 423 $errno, 424 $errstr, 425 $timeout, 426 STREAM_CLIENT_CONNECT, 427 $socket_context 428 ); 429 } else { 430 //Fall back to fsockopen which should work in more places, but is missing some features 431 $this->edebug( 432 'Connection: stream_socket_client not available, falling back to fsockopen', 433 self::DEBUG_CONNECTION 434 ); 435 set_error_handler(function () { 436 call_user_func_array([$this, 'errorHandler'], func_get_args()); 437 }); 438 $connection = fsockopen( 439 $host, 440 $port, 441 $errno, 442 $errstr, 443 $timeout 444 ); 445 } 446 restore_error_handler(); 447 448 //Verify we connected properly 449 if (!is_resource($connection)) { 450 $this->setError( 451 'Failed to connect to server', 452 '', 453 (string) $errno, 454 $errstr 455 ); 456 $this->edebug( 457 'SMTP ERROR: ' . $this->error['error'] 458 . ": $errstr ($errno)", 459 self::DEBUG_CLIENT 460 ); 461 462 return false; 463 } 464 465 //SMTP server can take longer to respond, give longer timeout for first read 466 //Windows does not have support for this timeout function 467 if (strpos(PHP_OS, 'WIN') !== 0) { 468 $max = (int)ini_get('max_execution_time'); 469 //Don't bother if unlimited, or if set_time_limit is disabled 470 if (0 !== $max && $timeout > $max && strpos(ini_get('disable_functions'), 'set_time_limit') === false) { 471 @set_time_limit($timeout); 472 } 473 stream_set_timeout($connection, $timeout, 0); 474 } 475 476 return $connection; 477 } 478 479 /** 480 * Initiate a TLS (encrypted) session. 481 * 482 * @return bool 483 */ 484 public function startTLS() 485 { 486 if (!$this->sendCommand('STARTTLS', 'STARTTLS', 220)) { 487 return false; 488 } 489 490 //Allow the best TLS version(s) we can 491 $crypto_method = STREAM_CRYPTO_METHOD_TLS_CLIENT; 492 493 //PHP 5.6.7 dropped inclusion of TLS 1.1 and 1.2 in STREAM_CRYPTO_METHOD_TLS_CLIENT 494 //so add them back in manually if we can 495 if (defined('STREAM_CRYPTO_METHOD_TLSv1_2_CLIENT')) { 496 $crypto_method |= STREAM_CRYPTO_METHOD_TLSv1_2_CLIENT; 497 $crypto_method |= STREAM_CRYPTO_METHOD_TLSv1_1_CLIENT; 498 } 499 500 //Begin encrypted connection 501 set_error_handler(function () { 502 call_user_func_array([$this, 'errorHandler'], func_get_args()); 503 }); 504 $crypto_ok = stream_socket_enable_crypto( 505 $this->smtp_conn, 506 true, 507 $crypto_method 508 ); 509 restore_error_handler(); 510 511 return (bool) $crypto_ok; 512 } 513 514 /** 515 * Perform SMTP authentication. 516 * Must be run after hello(). 517 * 518 * @see hello() 519 * 520 * @param string $username The user name 521 * @param string $password The password 522 * @param string $authtype The auth type (CRAM-MD5, PLAIN, LOGIN, XOAUTH2) 523 * @param OAuthTokenProvider $OAuth An optional OAuthTokenProvider instance for XOAUTH2 authentication 524 * 525 * @return bool True if successfully authenticated 526 */ 527 public function authenticate( 528 $username, 529 $password, 530 $authtype = null, 531 $OAuth = null 532 ) { 533 if (!$this->server_caps) { 534 $this->setError('Authentication is not allowed before HELO/EHLO'); 535 536 return false; 537 } 538 539 if (array_key_exists('EHLO', $this->server_caps)) { 540 //SMTP extensions are available; try to find a proper authentication method 541 if (!array_key_exists('AUTH', $this->server_caps)) { 542 $this->setError('Authentication is not allowed at this stage'); 543 //'at this stage' means that auth may be allowed after the stage changes 544 //e.g. after STARTTLS 545 546 return false; 547 } 548 549 $this->edebug('Auth method requested: ' . ($authtype ?: 'UNSPECIFIED'), self::DEBUG_LOWLEVEL); 550 $this->edebug( 551 'Auth methods available on the server: ' . implode(',', $this->server_caps['AUTH']), 552 self::DEBUG_LOWLEVEL 553 ); 554 555 //If we have requested a specific auth type, check the server supports it before trying others 556 if (null !== $authtype && !in_array($authtype, $this->server_caps['AUTH'], true)) { 557 $this->edebug('Requested auth method not available: ' . $authtype, self::DEBUG_LOWLEVEL); 558 $authtype = null; 559 } 560 561 if (empty($authtype)) { 562 //If no auth mechanism is specified, attempt to use these, in this order 563 //Try CRAM-MD5 first as it's more secure than the others 564 foreach (['CRAM-MD5', 'LOGIN', 'PLAIN', 'XOAUTH2'] as $method) { 565 if (in_array($method, $this->server_caps['AUTH'], true)) { 566 $authtype = $method; 567 break; 568 } 569 } 570 if (empty($authtype)) { 571 $this->setError('No supported authentication methods found'); 572 573 return false; 574 } 575 $this->edebug('Auth method selected: ' . $authtype, self::DEBUG_LOWLEVEL); 576 } 577 578 if (!in_array($authtype, $this->server_caps['AUTH'], true)) { 579 $this->setError("The requested authentication method \"$authtype\" is not supported by the server"); 580 581 return false; 582 } 583 } elseif (empty($authtype)) { 584 $authtype = 'LOGIN'; 585 } 586 switch ($authtype) { 587 case 'PLAIN': 588 //Start authentication 589 if (!$this->sendCommand('AUTH', 'AUTH PLAIN', 334)) { 590 return false; 591 } 592 //Send encoded username and password 593 if ( 594 //Format from https://www.rfc-editor.org/rfc/rfc4616#section-2 595 //We skip the first field (it's forgery), so the string starts with a null byte 596 !$this->sendCommand( 597 'User & Password', 598 base64_encode("\0" . $username . "\0" . $password), 599 235 600 ) 601 ) { 602 return false; 603 } 604 break; 605 case 'LOGIN': 606 //Start authentication 607 if (!$this->sendCommand('AUTH', 'AUTH LOGIN', 334)) { 608 return false; 609 } 610 if (!$this->sendCommand('Username', base64_encode($username), 334)) { 611 return false; 612 } 613 if (!$this->sendCommand('Password', base64_encode($password), 235)) { 614 return false; 615 } 616 break; 617 case 'CRAM-MD5': 618 //Start authentication 619 if (!$this->sendCommand('AUTH CRAM-MD5', 'AUTH CRAM-MD5', 334)) { 620 return false; 621 } 622 //Get the challenge 623 $challenge = base64_decode(substr($this->last_reply, 4)); 624 625 //Build the response 626 $response = $username . ' ' . $this->hmac($challenge, $password); 627 628 //send encoded credentials 629 return $this->sendCommand('Username', base64_encode($response), 235); 630 case 'XOAUTH2': 631 //The OAuth instance must be set up prior to requesting auth. 632 if (null === $OAuth) { 633 return false; 634 } 635 $oauth = $OAuth->getOauth64(); 636 637 //Start authentication 638 if (!$this->sendCommand('AUTH', 'AUTH XOAUTH2 ' . $oauth, 235)) { 639 return false; 640 } 641 break; 642 default: 643 $this->setError("Authentication method \"$authtype\" is not supported"); 644 645 return false; 646 } 647 648 return true; 649 } 650 651 /** 652 * Calculate an MD5 HMAC hash. 653 * Works like hash_hmac('md5', $data, $key) 654 * in case that function is not available. 655 * 656 * @param string $data The data to hash 657 * @param string $key The key to hash with 658 * 659 * @return string 660 */ 661 protected function hmac($data, $key) 662 { 663 if (function_exists('hash_hmac')) { 664 return hash_hmac('md5', $data, $key); 665 } 666 667 //The following borrowed from 668 //https://www.php.net/manual/en/function.mhash.php#27225 669 670 //RFC 2104 HMAC implementation for php. 671 //Creates an md5 HMAC. 672 //Eliminates the need to install mhash to compute a HMAC 673 //by Lance Rushing 674 675 $bytelen = 64; //byte length for md5 676 if (strlen($key) > $bytelen) { 677 $key = pack('H*', md5($key)); 678 } 679 $key = str_pad($key, $bytelen, chr(0x00)); 680 $ipad = str_pad('', $bytelen, chr(0x36)); 681 $opad = str_pad('', $bytelen, chr(0x5c)); 682 $k_ipad = $key ^ $ipad; 683 $k_opad = $key ^ $opad; 684 685 return md5($k_opad . pack('H*', md5($k_ipad . $data))); 686 } 687 688 /** 689 * Check connection state. 690 * 691 * @return bool True if connected 692 */ 693 public function connected() 694 { 695 if (is_resource($this->smtp_conn)) { 696 $sock_status = stream_get_meta_data($this->smtp_conn); 697 if ($sock_status['eof']) { 698 //The socket is valid but we are not connected 699 $this->edebug( 700 'SMTP NOTICE: EOF caught while checking if connected', 701 self::DEBUG_CLIENT 702 ); 703 $this->close(); 704 705 return false; 706 } 707 708 return true; //everything looks good 709 } 710 711 return false; 712 } 713 714 /** 715 * Close the socket and clean up the state of the class. 716 * Don't use this function without first trying to use QUIT. 717 * 718 * @see quit() 719 */ 720 public function close() 721 { 722 $this->server_caps = null; 723 $this->helo_rply = null; 724 if (is_resource($this->smtp_conn)) { 725 //Close the connection and cleanup 726 fclose($this->smtp_conn); 727 $this->smtp_conn = null; //Makes for cleaner serialization 728 $this->edebug('Connection: closed', self::DEBUG_CONNECTION); 729 } 730 } 731 732 /** 733 * Send an SMTP DATA command. 734 * Issues a data command and sends the msg_data to the server, 735 * finalizing the mail transaction. $msg_data is the message 736 * that is to be sent with the headers. Each header needs to be 737 * on a single line followed by a <CRLF> with the message headers 738 * and the message body being separated by an additional <CRLF>. 739 * Implements RFC 821: DATA <CRLF>. 740 * 741 * @param string $msg_data Message data to send 742 * 743 * @return bool 744 */ 745 public function data($msg_data) 746 { 747 //This will use the standard timelimit 748 if (!$this->sendCommand('DATA', 'DATA', 354)) { 749 return false; 750 } 751 752 /* The server is ready to accept data! 753 * According to rfc821 we should not send more than 1000 characters on a single line (including the LE) 754 * so we will break the data up into lines by \r and/or \n then if needed we will break each of those into 755 * smaller lines to fit within the limit. 756 * We will also look for lines that start with a '.' and prepend an additional '.'. 757 * NOTE: this does not count towards line-length limit. 758 */ 759 760 //Normalize line breaks before exploding 761 $lines = explode("\n", str_replace(["\r\n", "\r"], "\n", $msg_data)); 762 763 /* To distinguish between a complete RFC822 message and a plain message body, we check if the first field 764 * of the first line (':' separated) does not contain a space then it _should_ be a header, and we will 765 * process all lines before a blank line as headers. 766 */ 767 768 $field = substr($lines[0], 0, strpos($lines[0], ':')); 769 $in_headers = false; 770 if (!empty($field) && strpos($field, ' ') === false) { 771 $in_headers = true; 772 } 773 774 foreach ($lines as $line) { 775 $lines_out = []; 776 if ($in_headers && $line === '') { 777 $in_headers = false; 778 } 779 //Break this line up into several smaller lines if it's too long 780 //Micro-optimisation: isset($str[$len]) is faster than (strlen($str) > $len), 781 while (isset($line[self::MAX_LINE_LENGTH])) { 782 //Working backwards, try to find a space within the last MAX_LINE_LENGTH chars of the line to break on 783 //so as to avoid breaking in the middle of a word 784 $pos = strrpos(substr($line, 0, self::MAX_LINE_LENGTH), ' '); 785 //Deliberately matches both false and 0 786 if (!$pos) { 787 //No nice break found, add a hard break 788 $pos = self::MAX_LINE_LENGTH - 1; 789 $lines_out[] = substr($line, 0, $pos); 790 $line = substr($line, $pos); 791 } else { 792 //Break at the found point 793 $lines_out[] = substr($line, 0, $pos); 794 //Move along by the amount we dealt with 795 $line = substr($line, $pos + 1); 796 } 797 //If processing headers add a LWSP-char to the front of new line RFC822 section 3.1.1 798 if ($in_headers) { 799 $line = "\t" . $line; 800 } 801 } 802 $lines_out[] = $line; 803 804 //Send the lines to the server 805 foreach ($lines_out as $line_out) { 806 //Dot-stuffing as per RFC5321 section 4.5.2 807 //https://www.rfc-editor.org/rfc/rfc5321#section-4.5.2 808 if (!empty($line_out) && $line_out[0] === '.') { 809 $line_out = '.' . $line_out; 810 } 811 $this->client_send($line_out . static::LE, 'DATA'); 812 } 813 } 814 815 //Message data has been sent, complete the command 816 //Increase timelimit for end of DATA command 817 $savetimelimit = $this->Timelimit; 818 $this->Timelimit *= 2; 819 $result = $this->sendCommand('DATA END', '.', 250); 820 $this->recordLastTransactionID(); 821 //Restore timelimit 822 $this->Timelimit = $savetimelimit; 823 824 return $result; 825 } 826 827 /** 828 * Send an SMTP HELO or EHLO command. 829 * Used to identify the sending server to the receiving server. 830 * This makes sure that client and server are in a known state. 831 * Implements RFC 821: HELO <SP> <domain> <CRLF> 832 * and RFC 2821 EHLO. 833 * 834 * @param string $host The host name or IP to connect to 835 * 836 * @return bool 837 */ 838 public function hello($host = '') 839 { 840 //Try extended hello first (RFC 2821) 841 if ($this->sendHello('EHLO', $host)) { 842 return true; 843 } 844 845 //Some servers shut down the SMTP service here (RFC 5321) 846 if (substr($this->helo_rply, 0, 3) == '421') { 847 return false; 848 } 849 850 return $this->sendHello('HELO', $host); 851 } 852 853 /** 854 * Send an SMTP HELO or EHLO command. 855 * Low-level implementation used by hello(). 856 * 857 * @param string $hello The HELO string 858 * @param string $host The hostname to say we are 859 * 860 * @return bool 861 * 862 * @see hello() 863 */ 864 protected function sendHello($hello, $host) 865 { 866 $noerror = $this->sendCommand($hello, $hello . ' ' . $host, 250); 867 $this->helo_rply = $this->last_reply; 868 if ($noerror) { 869 $this->parseHelloFields($hello); 870 } else { 871 $this->server_caps = null; 872 } 873 874 return $noerror; 875 } 876 877 /** 878 * Parse a reply to HELO/EHLO command to discover server extensions. 879 * In case of HELO, the only parameter that can be discovered is a server name. 880 * 881 * @param string $type `HELO` or `EHLO` 882 */ 883 protected function parseHelloFields($type) 884 { 885 $this->server_caps = []; 886 $lines = explode("\n", $this->helo_rply); 887 888 foreach ($lines as $n => $s) { 889 //First 4 chars contain response code followed by - or space 890 $s = trim(substr($s, 4)); 891 if (empty($s)) { 892 continue; 893 } 894 $fields = explode(' ', $s); 895 if (!empty($fields)) { 896 if (!$n) { 897 $name = $type; 898 $fields = $fields[0]; 899 } else { 900 $name = array_shift($fields); 901 switch ($name) { 902 case 'SIZE': 903 $fields = ($fields ? $fields[0] : 0); 904 break; 905 case 'AUTH': 906 if (!is_array($fields)) { 907 $fields = []; 908 } 909 break; 910 default: 911 $fields = true; 912 } 913 } 914 $this->server_caps[$name] = $fields; 915 } 916 } 917 } 918 919 /** 920 * Send an SMTP MAIL command. 921 * Starts a mail transaction from the email address specified in 922 * $from. Returns true if successful or false otherwise. If True 923 * the mail transaction is started and then one or more recipient 924 * commands may be called followed by a data command. 925 * Implements RFC 821: MAIL <SP> FROM:<reverse-path> <CRLF> and 926 * two extensions, namely XVERP and SMTPUTF8. 927 * 928 * The server's EHLO response is not checked. If use of either 929 * extensions is enabled even though the server does not support 930 * that, mail submission will fail. 931 * 932 * XVERP is documented at https://www.postfix.org/VERP_README.html 933 * and SMTPUTF8 is specified in RFC 6531. 934 * 935 * @param string $from Source address of this message 936 * 937 * @return bool 938 */ 939 public function mail($from) 940 { 941 $useVerp = ($this->do_verp ? ' XVERP' : ''); 942 $useSmtputf8 = ($this->do_smtputf8 ? ' SMTPUTF8' : ''); 943 944 return $this->sendCommand( 945 'MAIL FROM', 946 'MAIL FROM:<' . $from . '>' . $useSmtputf8 . $useVerp, 947 250 948 ); 949 } 950 951 /** 952 * Send an SMTP QUIT command. 953 * Closes the socket if there is no error or the $close_on_error argument is true. 954 * Implements from RFC 821: QUIT <CRLF>. 955 * 956 * @param bool $close_on_error Should the connection close if an error occurs? 957 * 958 * @return bool 959 */ 960 public function quit($close_on_error = true) 961 { 962 $noerror = $this->sendCommand('QUIT', 'QUIT', 221); 963 $err = $this->error; //Save any error 964 if ($noerror || $close_on_error) { 965 $this->close(); 966 $this->error = $err; //Restore any error from the quit command 967 } 968 969 return $noerror; 970 } 971 972 /** 973 * Send an SMTP RCPT command. 974 * Sets the TO argument to $toaddr. 975 * Returns true if the recipient was accepted false if it was rejected. 976 * Implements from RFC 821: RCPT <SP> TO:<forward-path> <CRLF>. 977 * 978 * @param string $address The address the message is being sent to 979 * @param string $dsn Comma separated list of DSN notifications. NEVER, SUCCESS, FAILURE 980 * or DELAY. If you specify NEVER all other notifications are ignored. 981 * 982 * @return bool 983 */ 984 public function recipient($address, $dsn = '') 985 { 986 if (empty($dsn)) { 987 $rcpt = 'RCPT TO:<' . $address . '>'; 988 } else { 989 $dsn = strtoupper($dsn); 990 $notify = []; 991 992 if (strpos($dsn, 'NEVER') !== false) { 993 $notify[] = 'NEVER'; 994 } else { 995 foreach (['SUCCESS', 'FAILURE', 'DELAY'] as $value) { 996 if (strpos($dsn, $value) !== false) { 997 $notify[] = $value; 998 } 999 } 1000 } 1001 1002 $rcpt = 'RCPT TO:<' . $address . '> NOTIFY=' . implode(',', $notify); 1003 } 1004 1005 return $this->sendCommand( 1006 'RCPT TO', 1007 $rcpt, 1008 [250, 251] 1009 ); 1010 } 1011 1012 /** 1013 * Send SMTP XCLIENT command to server and check its return code. 1014 * 1015 * @return bool True on success 1016 */ 1017 public function xclient(array $vars) 1018 { 1019 $xclient_options = ""; 1020 foreach ($vars as $key => $value) { 1021 if (in_array($key, SMTP::$xclient_allowed_attributes)) { 1022 $xclient_options .= " {$key}={$value}"; 1023 } 1024 } 1025 if (!$xclient_options) { 1026 return true; 1027 } 1028 return $this->sendCommand('XCLIENT', 'XCLIENT' . $xclient_options, 250); 1029 } 1030 1031 /** 1032 * Send an SMTP RSET command. 1033 * Abort any transaction that is currently in progress. 1034 * Implements RFC 821: RSET <CRLF>. 1035 * 1036 * @return bool True on success 1037 */ 1038 public function reset() 1039 { 1040 return $this->sendCommand('RSET', 'RSET', 250); 1041 } 1042 1043 /** 1044 * Send a command to an SMTP server and check its return code. 1045 * 1046 * @param string $command The command name - not sent to the server 1047 * @param string $commandstring The actual command to send 1048 * @param int|array $expect One or more expected integer success codes 1049 * 1050 * @return bool True on success 1051 */ 1052 protected function sendCommand($command, $commandstring, $expect) 1053 { 1054 if (!$this->connected()) { 1055 $this->setError("Called $command without being connected"); 1056 1057 return false; 1058 } 1059 //Reject line breaks in all commands 1060 if ((strpos($commandstring, "\n") !== false) || (strpos($commandstring, "\r") !== false)) { 1061 $this->setError("Command '$command' contained line breaks"); 1062 1063 return false; 1064 } 1065 $this->client_send($commandstring . static::LE, $command); 1066 1067 $this->last_reply = $this->get_lines(); 1068 //Fetch SMTP code and possible error code explanation 1069 $matches = []; 1070 if (preg_match('/^([\d]{3})[ -](?:([\d]\\.[\d]\\.[\d]{1,2}) )?/', $this->last_reply, $matches)) { 1071 $code = (int) $matches[1]; 1072 $code_ex = (count($matches) > 2 ? $matches[2] : null); 1073 //Cut off error code from each response line 1074 $detail = preg_replace( 1075 "/{$code}[ -]" . 1076 ($code_ex ? str_replace('.', '\\.', $code_ex) . ' ' : '') . '/m', 1077 '', 1078 $this->last_reply 1079 ); 1080 } else { 1081 //Fall back to simple parsing if regex fails 1082 $code = (int) substr($this->last_reply, 0, 3); 1083 $code_ex = null; 1084 $detail = substr($this->last_reply, 4); 1085 } 1086 1087 $this->edebug('SERVER -> CLIENT: ' . $this->last_reply, self::DEBUG_SERVER); 1088 1089 if (!in_array($code, (array) $expect, true)) { 1090 $this->setError( 1091 "$command command failed", 1092 $detail, 1093 $code, 1094 $code_ex 1095 ); 1096 $this->edebug( 1097 'SMTP ERROR: ' . $this->error['error'] . ': ' . $this->last_reply, 1098 self::DEBUG_CLIENT 1099 ); 1100 1101 return false; 1102 } 1103 1104 //Don't clear the error store when using keepalive 1105 if ($command !== 'RSET') { 1106 $this->setError(''); 1107 } 1108 1109 return true; 1110 } 1111 1112 /** 1113 * Send an SMTP SAML command. 1114 * Starts a mail transaction from the email address specified in $from. 1115 * Returns true if successful or false otherwise. If True 1116 * the mail transaction is started and then one or more recipient 1117 * commands may be called followed by a data command. This command 1118 * will send the message to the users terminal if they are logged 1119 * in and send them an email. 1120 * Implements RFC 821: SAML <SP> FROM:<reverse-path> <CRLF>. 1121 * 1122 * @param string $from The address the message is from 1123 * 1124 * @return bool 1125 */ 1126 public function sendAndMail($from) 1127 { 1128 return $this->sendCommand('SAML', "SAML FROM:$from", 250); 1129 } 1130 1131 /** 1132 * Send an SMTP VRFY command. 1133 * 1134 * @param string $name The name to verify 1135 * 1136 * @return bool 1137 */ 1138 public function verify($name) 1139 { 1140 return $this->sendCommand('VRFY', "VRFY $name", [250, 251]); 1141 } 1142 1143 /** 1144 * Send an SMTP NOOP command. 1145 * Used to keep keep-alives alive, doesn't actually do anything. 1146 * 1147 * @return bool 1148 */ 1149 public function noop() 1150 { 1151 return $this->sendCommand('NOOP', 'NOOP', 250); 1152 } 1153 1154 /** 1155 * Send an SMTP TURN command. 1156 * This is an optional command for SMTP that this class does not support. 1157 * This method is here to make the RFC821 Definition complete for this class 1158 * and _may_ be implemented in future. 1159 * Implements from RFC 821: TURN <CRLF>. 1160 * 1161 * @return bool 1162 */ 1163 public function turn() 1164 { 1165 $this->setError('The SMTP TURN command is not implemented'); 1166 $this->edebug('SMTP NOTICE: ' . $this->error['error'], self::DEBUG_CLIENT); 1167 1168 return false; 1169 } 1170 1171 /** 1172 * Send raw data to the server. 1173 * 1174 * @param string $data The data to send 1175 * @param string $command Optionally, the command this is part of, used only for controlling debug output 1176 * 1177 * @return int|bool The number of bytes sent to the server or false on error 1178 */ 1179 public function client_send($data, $command = '') 1180 { 1181 //If SMTP transcripts are left enabled, or debug output is posted online 1182 //it can leak credentials, so hide credentials in all but lowest level 1183 if ( 1184 self::DEBUG_LOWLEVEL > $this->do_debug && 1185 in_array($command, ['User & Password', 'Username', 'Password'], true) 1186 ) { 1187 $this->edebug('CLIENT -> SERVER: [credentials hidden]', self::DEBUG_CLIENT); 1188 } else { 1189 $this->edebug('CLIENT -> SERVER: ' . $data, self::DEBUG_CLIENT); 1190 } 1191 set_error_handler(function () { 1192 call_user_func_array([$this, 'errorHandler'], func_get_args()); 1193 }); 1194 $result = fwrite($this->smtp_conn, $data); 1195 restore_error_handler(); 1196 1197 return $result; 1198 } 1199 1200 /** 1201 * Get the latest error. 1202 * 1203 * @return array 1204 */ 1205 public function getError() 1206 { 1207 return $this->error; 1208 } 1209 1210 /** 1211 * Get SMTP extensions available on the server. 1212 * 1213 * @return array|null 1214 */ 1215 public function getServerExtList() 1216 { 1217 return $this->server_caps; 1218 } 1219 1220 /** 1221 * Get metadata about the SMTP server from its HELO/EHLO response. 1222 * The method works in three ways, dependent on argument value and current state: 1223 * 1. HELO/EHLO has not been sent - returns null and populates $this->error. 1224 * 2. HELO has been sent - 1225 * $name == 'HELO': returns server name 1226 * $name == 'EHLO': returns boolean false 1227 * $name == any other string: returns null and populates $this->error 1228 * 3. EHLO has been sent - 1229 * $name == 'HELO'|'EHLO': returns the server name 1230 * $name == any other string: if extension $name exists, returns True 1231 * or its options (e.g. AUTH mechanisms supported). Otherwise returns False. 1232 * 1233 * @param string $name Name of SMTP extension or 'HELO'|'EHLO' 1234 * 1235 * @return string|bool|null 1236 */ 1237 public function getServerExt($name) 1238 { 1239 if (!$this->server_caps) { 1240 $this->setError('No HELO/EHLO was sent'); 1241 1242 return null; 1243 } 1244 1245 if (!array_key_exists($name, $this->server_caps)) { 1246 if ('HELO' === $name) { 1247 return $this->server_caps['EHLO']; 1248 } 1249 if ('EHLO' === $name || array_key_exists('EHLO', $this->server_caps)) { 1250 return false; 1251 } 1252 $this->setError('HELO handshake was used; No information about server extensions available'); 1253 1254 return null; 1255 } 1256 1257 return $this->server_caps[$name]; 1258 } 1259 1260 /** 1261 * Get the last reply from the server. 1262 * 1263 * @return string 1264 */ 1265 public function getLastReply() 1266 { 1267 return $this->last_reply; 1268 } 1269 1270 /** 1271 * Read the SMTP server's response. 1272 * Either before eof or socket timeout occurs on the operation. 1273 * With SMTP we can tell if we have more lines to read if the 1274 * 4th character is '-' symbol. If it is a space then we don't 1275 * need to read anything else. 1276 * 1277 * @return string 1278 */ 1279 protected function get_lines() 1280 { 1281 //If the connection is bad, give up straight away 1282 if (!is_resource($this->smtp_conn)) { 1283 return ''; 1284 } 1285 $data = ''; 1286 $endtime = 0; 1287 stream_set_timeout($this->smtp_conn, $this->Timeout); 1288 if ($this->Timelimit > 0) { 1289 $endtime = time() + $this->Timelimit; 1290 } 1291 $selR = [$this->smtp_conn]; 1292 $selW = null; 1293 while (is_resource($this->smtp_conn) && !feof($this->smtp_conn)) { 1294 //Must pass vars in here as params are by reference 1295 //solution for signals inspired by https://github.com/symfony/symfony/pull/6540 1296 set_error_handler(function () { 1297 call_user_func_array([$this, 'errorHandler'], func_get_args()); 1298 }); 1299 $n = stream_select($selR, $selW, $selW, $this->Timelimit); 1300 restore_error_handler(); 1301 1302 if ($n === false) { 1303 $message = $this->getError()['detail']; 1304 1305 $this->edebug( 1306 'SMTP -> get_lines(): select failed (' . $message . ')', 1307 self::DEBUG_LOWLEVEL 1308 ); 1309 1310 //stream_select returns false when the `select` system call is interrupted 1311 //by an incoming signal, try the select again 1312 if (stripos($message, 'interrupted system call') !== false) { 1313 $this->edebug( 1314 'SMTP -> get_lines(): retrying stream_select', 1315 self::DEBUG_LOWLEVEL 1316 ); 1317 $this->setError(''); 1318 continue; 1319 } 1320 1321 break; 1322 } 1323 1324 if (!$n) { 1325 $this->edebug( 1326 'SMTP -> get_lines(): select timed-out in (' . $this->Timelimit . ' sec)', 1327 self::DEBUG_LOWLEVEL 1328 ); 1329 break; 1330 } 1331 1332 //Deliberate noise suppression - errors are handled afterwards 1333 $str = @fgets($this->smtp_conn, self::MAX_REPLY_LENGTH); 1334 $this->edebug('SMTP INBOUND: "' . trim($str) . '"', self::DEBUG_LOWLEVEL); 1335 $data .= $str; 1336 //If response is only 3 chars (not valid, but RFC5321 S4.2 says it must be handled), 1337 //or 4th character is a space or a line break char, we are done reading, break the loop. 1338 //String array access is a significant micro-optimisation over strlen 1339 if (!isset($str[3]) || $str[3] === ' ' || $str[3] === "\r" || $str[3] === "\n") { 1340 break; 1341 } 1342 //Timed-out? Log and break 1343 $info = stream_get_meta_data($this->smtp_conn); 1344 if ($info['timed_out']) { 1345 $this->edebug( 1346 'SMTP -> get_lines(): stream timed-out (' . $this->Timeout . ' sec)', 1347 self::DEBUG_LOWLEVEL 1348 ); 1349 break; 1350 } 1351 //Now check if reads took too long 1352 if ($endtime && time() > $endtime) { 1353 $this->edebug( 1354 'SMTP -> get_lines(): timelimit reached (' . 1355 $this->Timelimit . ' sec)', 1356 self::DEBUG_LOWLEVEL 1357 ); 1358 break; 1359 } 1360 } 1361 1362 return $data; 1363 } 1364 1365 /** 1366 * Enable or disable VERP address generation. 1367 * 1368 * @param bool $enabled 1369 */ 1370 public function setVerp($enabled = false) 1371 { 1372 $this->do_verp = $enabled; 1373 } 1374 1375 /** 1376 * Get VERP address generation mode. 1377 * 1378 * @return bool 1379 */ 1380 public function getVerp() 1381 { 1382 return $this->do_verp; 1383 } 1384 1385 /** 1386 * Enable or disable use of SMTPUTF8. 1387 * 1388 * @param bool $enabled 1389 */ 1390 public function setSMTPUTF8($enabled = false) 1391 { 1392 $this->do_smtputf8 = $enabled; 1393 } 1394 1395 /** 1396 * Get SMTPUTF8 use. 1397 * 1398 * @return bool 1399 */ 1400 public function getSMTPUTF8() 1401 { 1402 return $this->do_smtputf8; 1403 } 1404 1405 /** 1406 * Set error messages and codes. 1407 * 1408 * @param string $message The error message 1409 * @param string $detail Further detail on the error 1410 * @param string $smtp_code An associated SMTP error code 1411 * @param string $smtp_code_ex Extended SMTP code 1412 */ 1413 protected function setError($message, $detail = '', $smtp_code = '', $smtp_code_ex = '') 1414 { 1415 $this->error = [ 1416 'error' => $message, 1417 'detail' => $detail, 1418 'smtp_code' => $smtp_code, 1419 'smtp_code_ex' => $smtp_code_ex, 1420 ]; 1421 } 1422 1423 /** 1424 * Set debug output method. 1425 * 1426 * @param string|callable $method The name of the mechanism to use for debugging output, or a callable to handle it 1427 */ 1428 public function setDebugOutput($method = 'echo') 1429 { 1430 $this->Debugoutput = $method; 1431 } 1432 1433 /** 1434 * Get debug output method. 1435 * 1436 * @return string 1437 */ 1438 public function getDebugOutput() 1439 { 1440 return $this->Debugoutput; 1441 } 1442 1443 /** 1444 * Set debug output level. 1445 * 1446 * @param int $level 1447 */ 1448 public function setDebugLevel($level = 0) 1449 { 1450 $this->do_debug = $level; 1451 } 1452 1453 /** 1454 * Get debug output level. 1455 * 1456 * @return int 1457 */ 1458 public function getDebugLevel() 1459 { 1460 return $this->do_debug; 1461 } 1462 1463 /** 1464 * Set SMTP timeout. 1465 * 1466 * @param int $timeout The timeout duration in seconds 1467 */ 1468 public function setTimeout($timeout = 0) 1469 { 1470 $this->Timeout = $timeout; 1471 } 1472 1473 /** 1474 * Get SMTP timeout. 1475 * 1476 * @return int 1477 */ 1478 public function getTimeout() 1479 { 1480 return $this->Timeout; 1481 } 1482 1483 /** 1484 * Reports an error number and string. 1485 * 1486 * @param int $errno The error number returned by PHP 1487 * @param string $errmsg The error message returned by PHP 1488 * @param string $errfile The file the error occurred in 1489 * @param int $errline The line number the error occurred on 1490 */ 1491 protected function errorHandler($errno, $errmsg, $errfile = '', $errline = 0) 1492 { 1493 $notice = 'Connection failed.'; 1494 $this->setError( 1495 $notice, 1496 $errmsg, 1497 (string) $errno 1498 ); 1499 $this->edebug( 1500 "$notice Error #$errno: $errmsg [$errfile line $errline]", 1501 self::DEBUG_CONNECTION 1502 ); 1503 } 1504 1505 /** 1506 * Extract and return the ID of the last SMTP transaction based on 1507 * a list of patterns provided in SMTP::$smtp_transaction_id_patterns. 1508 * Relies on the host providing the ID in response to a DATA command. 1509 * If no reply has been received yet, it will return null. 1510 * If no pattern was matched, it will return false. 1511 * 1512 * @return bool|string|null 1513 */ 1514 protected function recordLastTransactionID() 1515 { 1516 $reply = $this->getLastReply(); 1517 1518 if (empty($reply)) { 1519 $this->last_smtp_transaction_id = null; 1520 } else { 1521 $this->last_smtp_transaction_id = false; 1522 foreach ($this->smtp_transaction_id_patterns as $smtp_transaction_id_pattern) { 1523 $matches = []; 1524 if (preg_match($smtp_transaction_id_pattern, $reply, $matches)) { 1525 $this->last_smtp_transaction_id = trim($matches[1]); 1526 break; 1527 } 1528 } 1529 } 1530 1531 return $this->last_smtp_transaction_id; 1532 } 1533 1534 /** 1535 * Get the queue/transaction ID of the last SMTP transaction 1536 * If no reply has been received yet, it will return null. 1537 * If no pattern was matched, it will return false. 1538 * 1539 * @return bool|string|null 1540 * 1541 * @see recordLastTransactionID() 1542 */ 1543 public function getLastTransactionID() 1544 { 1545 return $this->last_smtp_transaction_id; 1546 } 1547 }
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| Generated : Tue Aug 19 08:20:01 2025 | Cross-referenced by PHPXref |