functions/smtp.php

   1 <?php
   2
   3 /**
   4  * smtp.php
   5  *
   6  * Copyright (c) 1999-2002 The SquirrelMail Project Team
   7  * Licensed under the GNU GPL. For full terms see the file COPYING.
   8  *
   9  * This contains all the functions needed to send messages through
  10  * an smtp server or sendmail.
  11  *
  12  * $Id$
  13  */
  14
  15 /*****************************************************************/
  16 /*** THIS FILE NEEDS TO HAVE ITS FORMATTING FIXED!!!           ***/
  17 /*** PLEASE DO SO AND REMOVE THIS COMMENT SECTION.             ***/
  18 /***    + Base level indent should begin at left margin, as    ***/
  19 /***      the require_once and global lines below.             ***/
  20 /***    + All identation should consist of four space blocks   ***/
  21 /***    + Tab characters are evil.                             ***/
  22 /***    + all comments should use "slash-star ... star-slash"  ***/
  23 /***      style -- no pound characters, no slash-slash style   ***/
  24 /***    + FLOW CONTROL STATEMENTS (if, while, etc) SHOULD      ***/
  25 /***      ALWAYS USE { AND } CHARACTERS!!!                     ***/
  26 /***    + Please use ' instead of ", when possible. Note "     ***/
  27 /***      should always be used in _( ) function calls.        ***/
  28 /*** Thank you for your help making the SM code more readable. ***/
  29 /*****************************************************************/
  30
  31 require_once('../functions/addressbook.php');
  32 require_once('../functions/plugin.php');
  33 require_once('../functions/prefs.php');
  34
  35 global $username, $popuser, $domain;
  36
  37 // This should most probably go to some initialization...
  38 if (ereg("^([^@%/]+)[@%/](.+)$", $username, $usernamedata)) {
  39     $popuser = $usernamedata[1];
  40     $domain  = $usernamedata[2];
  41     unset($usernamedata);
  42 } else {
  43     $popuser = $username;
  44 }
  45 // We need domain for smtp
  46 if (!$domain)
  47     $domain = getenv('HOSTNAME');
  48
  49 // Returns true only if this message is multipart
  50 function isMultipart () {
  51     global $attachments;
  52
  53     if (count($attachments)>0)
  54         return true;
  55     else
  56         return false;
  57 }
  58
  59 // looks up aliases in the addressbook and expands them to
  60 // the full address.
  61 // Adds @$domain if it wasn't in the address book and if it
  62 // doesn't have an @ symbol in it
  63 function expandAddrs ($array) {
  64     global $domain;
  65
  66     // don't show errors -- kinda critical that we don't see
  67     // them here since the redirect won't work if we do show them
  68     $abook = addressbook_init(false);
  69     for ($i=0; $i < count($array); $i++) {
  70         $result = $abook->lookup($array[$i]);
  71         $ret = "";
  72         if (isset($result['email'])) {
  73             if (isset($result['name'])) {
  74                 $ret = '"'.$result['name'].'" ';
  75             }
  76             $ret .= '<'.$result['email'].'>';
  77             $array[$i] = $ret;
  78         }
  79         else
  80             {
  81                 if (strpos($array[$i], '@') === false)
  82                     $array[$i] .= '@' . $domain;
  83                 $array[$i] = '<' . $array[$i] . '>';
  84             }
  85     }
  86     return $array;
  87 }
  88
  89
  90 // looks up aliases in the addressbook and expands them to
  91 // the RFC 821 valid RCPT address. ie <user@example.com>
  92 // Adds @$domain if it wasn't in the address book and if it
  93 // doesn't have an @ symbol in it
  94 function expandRcptAddrs ($array) {
  95     global $domain;
  96
  97     // don't show errors -- kinda critical that we don't see
  98     // them here since the redirect won't work if we do show them
  99     $abook = addressbook_init(false);
 100     for ($i=0; $i < count($array); $i++) {
 101         $result = $abook->lookup($array[$i]);
 102         $ret = "";
 103         if (isset($result['email'])) {
 104             $ret = '<'.$result['email'].'>';
 105             $array[$i] = $ret;
 106         }
 107         else {
 108             if (strpos($array[$i], '@') === false)
 109                 $array[$i] .= '@' . $domain;
 110             $array[$i] = '<' . $array[$i] . '>';
 111         }
 112     }
 113     return $array;
 114 }
 115
 116
 117 // Attach the files that are due to be attached
 118 function attachFiles ($fp) {
 119     global $attachments, $attachment_dir, $username;
 120
 121     $length = 0;
 122
 123     $hashed_attachment_dir = getHashedDir($username, $attachment_dir);
 124     if (isMultipart()) {
 125         foreach ($attachments as $info) {
 126             if (isset($info['type']))
 127                 $filetype = $info['type'];
 128             else
 129                 $filetype = 'application/octet-stream';
 130
 131             $header = '--'.mimeBoundary()."\r\n";
 132             $header .= "Content-Type: $filetype; name=\"" .
 133                 $info['remotefilename'] . "\"\r\n";
 134             $header .= "Content-Disposition: attachment; filename=\"" .
 135                 $info['remotefilename'] . "\"\r\n";
 136
 137             // Use 'rb' for NT systems -- read binary
 138             // Unix doesn't care -- everything's binary!  :-)
 139
 140             $filename = $hashed_attachment_dir . '/' . $info['localfilename'];
 141             $file = fopen ($filename, 'rb');
 142             if (substr($filetype, 0, 5) == 'text/' ||
 143                 $filetype == 'message/rfc822') {
 144                 $header .= "\r\n";
 145                 fputs ($fp, $header);
 146                 $length += strlen($header);
 147                 while ($tmp = fgets($file, 4096)) {
 148                     $tmp = str_replace("\r\n", "\n", $tmp);
 149                     $tmp = str_replace("\r", "\n", $tmp);
 150                     $tmp = str_replace("\n", "\r\n", $tmp);
 151                     if (feof($fp) && substr($tmp, -2) != "\r\n")
 152                         $tmp .= "\r\n";
 153                     fputs($fp, $tmp);
 154                     $length += strlen($tmp);
 155                 }
 156             } else {
 157                 $header .= "Content-Transfer-Encoding: base64\r\n\r\n";
 158                 fputs ($fp, $header);
 159                 $length += strlen($header);
 160                 while ($tmp = fread($file, 570)) {
 161                     $encoded = chunk_split(base64_encode($tmp));
 162                     $length += strlen($encoded);
 163                     fputs ($fp, $encoded);
 164                 }
 165             }
 166             fclose ($file);
 167         }
 168     }
 169     return $length;
 170 }
 171
 172 // Delete files that are uploaded for attaching
 173 function deleteAttachments() {
 174     global $attachments, $attachment_dir;
 175
 176     $hashed_attachment_dir = getHashedDir($username, $attachment_dir);
 177     if (isMultipart()) {
 178         reset($attachments);
 179         while (list($localname, $remotename) = each($attachments)) {
 180             if (!ereg ("\\/", $localname)) {
 181                 $filename = $hashed_attachment_dir . '/' . $localname;
 182                 unlink ($filename);
 183                 unlink ("$filename.info");
 184             }
 185         }
 186     }
 187 }
 188
 189 // Return a nice MIME-boundary
 190 function mimeBoundary () {
 191     static $mimeBoundaryString;
 192
 193     if ($mimeBoundaryString == "") {
 194         $mimeBoundaryString = "----=_" .
 195             GenerateRandomString(60, '\'()+,-./:=?_', 7);
 196     }
 197
 198     return $mimeBoundaryString;
 199 }
 200
 201 /* Time offset for correct timezone */
 202 function timezone () {
 203     global $invert_time;
 204
 205     $diff_second = date('Z');
 206     if ($invert_time)
 207         $diff_second = - $diff_second;
 208     if ($diff_second > 0)
 209         $sign = '+';
 210     else
 211         $sign = '-';
 212
 213     $diff_second = abs($diff_second);
 214
 215     $diff_hour = floor ($diff_second / 3600);
 216     $diff_minute = floor (($diff_second-3600*$diff_hour) / 60);
 217
 218     $zonename = '('.strftime('%Z').')';
 219     $result = sprintf ("%s%02d%02d %s", $sign, $diff_hour, $diff_minute, $zonename);
 220     return ($result);
 221 }
 222
 223 /* Print all the needed RFC822 headers */
 224 function write822Header ($fp, $t, $c, $b, $subject, $more_headers) {
 225     global $REMOTE_ADDR, $SERVER_NAME, $REMOTE_PORT;
 226     global $data_dir, $username, $popuser, $domain, $version, $useSendmail;
 227     global $default_charset, $HTTP_VIA, $HTTP_X_FORWARDED_FOR;
 228     global $REMOTE_HOST, $identity;
 229
 230     // Storing the header to make sure the header is the same
 231     // everytime the header is printed.
 232     static $header, $headerlength;
 233
 234     if ($header == '') {
 235         $to = expandAddrs(parseAddrs($t));
 236         $cc = expandAddrs(parseAddrs($c));
 237         $bcc = expandAddrs(parseAddrs($b));
 238         if (isset($identity) && $identity != 'default') {
 239             $reply_to = getPref($data_dir, $username, 'reply_to' . $identity);
 240             $from = getPref($data_dir, $username, 'full_name' . $identity);
 241             $from_addr = getPref($data_dir, $username, 'email_address' . $identity);
 242         } else {
 243             $reply_to = getPref($data_dir, $username, 'reply_to');
 244             $from = getPref($data_dir, $username, 'full_name');
 245             $from_addr = getPref($data_dir, $username, 'email_address');
 246         }
 247
 248         if ($from_addr == '')
 249             $from_addr = $popuser.'@'.$domain;
 250
 251         $to_list = getLineOfAddrs($to);
 252         $cc_list = getLineOfAddrs($cc);
 253         $bcc_list = getLineOfAddrs($bcc);
 254
 255         /* Encoding 8-bit characters and making from line */
 256         $subject = encodeHeader($subject);
 257         if ($from == '')
 258             $from = "<$from_addr>";
 259         else
 260             $from = '"' . encodeHeader($from) . "\" <$from_addr>";
 261
 262         /* This creates an RFC 822 date */
 263         $date = date("D, j M Y H:i:s ", mktime()) . timezone();
 264
 265         /* Create a message-id */
 266         $message_id = '<' . $REMOTE_PORT . '.' . $REMOTE_ADDR . '.';
 267         $message_id .= time() . '.squirrel@' . $SERVER_NAME .'>';
 268
 269         /* Make an RFC822 Received: line */
 270         if (isset($REMOTE_HOST))
 271             $received_from = "$REMOTE_HOST ([$REMOTE_ADDR])";
 272         else
 273             $received_from = $REMOTE_ADDR;
 274
 275         if (isset($HTTP_VIA) || isset ($HTTP_X_FORWARDED_FOR)) {
 276             if ($HTTP_X_FORWARDED_FOR == '')
 277                 $HTTP_X_FORWARDED_FOR = 'unknown';
 278             $received_from .= " (proxying for $HTTP_X_FORWARDED_FOR)";
 279         }
 280
 281         $header  = "Received: from $received_from\r\n";
 282         $header .= "        (SquirrelMail authenticated user $username)\r\n";
 283         $header .= "        by $SERVER_NAME with HTTP;\r\n";
 284         $header .= "        $date\r\n";
 285
 286         /* Insert the rest of the header fields */
 287         $header .= "Message-ID: $message_id\r\n";
 288         $header .= "Date: $date\r\n";
 289         $header .= "Subject: $subject\r\n";
 290         $header .= "From: $from\r\n";
 291         $header .= "To: $to_list\r\n";    // Who it's TO
 292
 293         /* Insert headers from the $more_headers array */
 294         if(is_array($more_headers)) {
 295             reset($more_headers);
 296             while(list($h_name, $h_val) = each($more_headers)) {
 297                 $header .= sprintf("%s: %s\r\n", $h_name, $h_val);
 298             }
 299         }
 300
 301         if ($cc_list) {
 302             $header .= "Cc: $cc_list\r\n"; // Who the CCs are
 303         }
 304
 305         if ($reply_to != '')
 306             $header .= "Reply-To: $reply_to\r\n";
 307
 308         if ($useSendmail) {
 309             if ($bcc_list) {
 310                 // BCCs is removed from header by sendmail
 311                 $header .= "Bcc: $bcc_list\r\n";
 312             }
 313         }
 314
 315         $header .= "X-Mailer: SquirrelMail (version $version)\r\n"; // Identify SquirrelMail
 316
 317         // Do the MIME-stuff
 318         $header .= "MIME-Version: 1.0\r\n";
 319
 320         if (isMultipart()) {
 321             $header .= 'Content-Type: multipart/mixed; boundary="';
 322             $header .= mimeBoundary();
 323             $header .= "\"\r\n";
 324         } else {
 325             if ($default_charset != '')
 326                 $header .= "Content-Type: text/plain; charset=$default_charset\r\n";
 327             else
 328                 $header .= "Content-Type: text/plain;\r\n";
 329             $header .= "Content-Transfer-Encoding: 8bit\r\n";
 330         }
 331         $header .= "\r\n"; // One blank line to separate header and body
 332
 333         $headerlength = strlen($header);
 334     }
 335
 336     // Write the header
 337     fputs ($fp, $header);
 338
 339     return $headerlength;
 340 }
 341
 342 // Send the body
 343 function writeBody ($fp, $passedBody) {
 344     global $default_charset;
 345
 346     $attachmentlength = 0;
 347
 348     if (isMultipart()) {
 349         $body = '--'.mimeBoundary()."\r\n";
 350
 351         if ($default_charset != "")
 352             $body .= "Content-Type: text/plain; charset=$default_charset\r\n";
 353         else
 354             $body .= "Content-Type: text/plain\r\n";
 355
 356         $body .= "Content-Transfer-Encoding: 8bit\r\n\r\n";
 357         $body .= $passedBody . "\r\n\r\n";
 358         fputs ($fp, $body);
 359
 360         $attachmentlength = attachFiles($fp);
 361
 362         if (!isset($postbody)) $postbody = "";
 363         $postbody .= "\r\n--".mimeBoundary()."--\r\n\r\n";
 364         fputs ($fp, $postbody);
 365     } else {
 366         $body = $passedBody . "\r\n";
 367         fputs ($fp, $body);
 368         $postbody = "\r\n";
 369         fputs ($fp, $postbody);
 370     }
 371
 372     return (strlen($body) + strlen($postbody) + $attachmentlength);
 373 }
 374
 375 // Send mail using the sendmail command
 376 function sendSendmail($t, $c, $b, $subject, $body, $more_headers) {
 377     global $sendmail_path, $popuser, $username, $domain;
 378
 379     // Build envelope sender address. Make sure it doesn't contain
 380     // spaces or other "weird" chars that would allow a user to
 381     // exploit the shell/pipe it is used in.
 382     $envelopefrom = "$popuser@$domain";
 383     $envelopefrom = ereg_replace("[[:blank:]]",'', $envelopefrom);
 384     $envelopefrom = ereg_replace("[[:space:]]",'', $envelopefrom);
 385     $envelopefrom = ereg_replace("[[:cntrl:]]",'', $envelopefrom);
 386
 387     // open pipe to sendmail or qmail-inject (qmail-inject doesn't accept -t param)
 388     if (strstr($sendmail_path, "qmail-inject")) {
 389         $fp = popen (escapeshellcmd("$sendmail_path -f$envelopefrom"), "w");
 390     } else {
 391         $fp = popen (escapeshellcmd("$sendmail_path -t -f$envelopefrom"), "w");
 392     }
 393
 394     $headerlength = write822Header ($fp, $t, $c, $b, $subject, $more_headers);
 395     $bodylength = writeBody($fp, $body);
 396
 397     pclose($fp);
 398
 399     return ($headerlength + $bodylength);
 400 }
 401
 402 function smtpReadData($smtpConnection) {
 403     $read = fgets($smtpConnection, 1024);
 404     $counter = 0;
 405     while ($read) {
 406         echo $read . '<BR>';
 407         $data[$counter] = $read;
 408         $read = fgets($smtpConnection, 1024);
 409         $counter++;
 410     }
 411 }
 412
 413 function sendSMTP($t, $c, $b, $subject, $body, $more_headers) {
 414     global $username, $popuser, $domain, $version, $smtpServerAddress,
 415         $smtpPort, $data_dir, $color, $use_authenticated_smtp, $identity,
 416         $key, $onetimepad;
 417
 418     $to = expandRcptAddrs(parseAddrs($t));
 419     $cc = expandRcptAddrs(parseAddrs($c));
 420     $bcc = expandRcptAddrs(parseAddrs($b));
 421     if (isset($identity) && $identity != 'default')
 422         $from_addr = getPref($data_dir, $username, 'email_address' . $identity);
 423     else
 424         $from_addr = getPref($data_dir, $username, 'email_address');
 425
 426     if (!$from_addr)
 427         $from_addr = "$popuser@$domain";
 428
 429     $smtpConnection = fsockopen($smtpServerAddress, $smtpPort, $errorNumber, $errorString);
 430     if (!$smtpConnection) {
 431         echo 'Error connecting to SMTP Server.<br>';
 432         echo "$errorNumber : $errorString<br>";
 433         exit;
 434     }
 435     $tmp = fgets($smtpConnection, 1024);
 436     if (errorCheck($tmp, $smtpConnection)!=5) return(0);
 437
 438     $to_list = getLineOfAddrs($to);
 439     $cc_list = getLineOfAddrs($cc);
 440
 441     /** Lets introduce ourselves */
 442     if (! isset ($use_authenticated_smtp) || $use_authenticated_smtp == false) {
 443         fputs($smtpConnection, "HELO $domain\r\n");
 444         $tmp = fgets($smtpConnection, 1024);
 445         if (errorCheck($tmp, $smtpConnection)!=5) return(0);
 446     } else {
 447         fputs($smtpConnection, "EHLO $domain\r\n");
 448         $tmp = fgets($smtpConnection, 1024);
 449         if (errorCheck($tmp, $smtpConnection)!=5) return(0);
 450
 451         fputs($smtpConnection, "AUTH LOGIN\r\n");
 452         $tmp = fgets($smtpConnection, 1024);
 453         if (errorCheck($tmp, $smtpConnection)!=5) return(0);
 454
 455         fputs($smtpConnection, base64_encode ($username) . "\r\n");
 456         $tmp = fgets($smtpConnection, 1024);
 457         if (errorCheck($tmp, $smtpConnection)!=5) return(0);
 458
 459         fputs($smtpConnection, base64_encode (OneTimePadDecrypt($key, $onetimepad)) . "\r\n");
 460         $tmp = fgets($smtpConnection, 1024);
 461         if (errorCheck($tmp, $smtpConnection)!=5) return(0);
 462     }
 463
 464     /** Ok, who is sending the message? */
 465     fputs($smtpConnection, "MAIL FROM: <$from_addr>\r\n");
 466     $tmp = fgets($smtpConnection, 1024);
 467     if (errorCheck($tmp, $smtpConnection)!=5) return(0);
 468
 469     /** send who the recipients are */
 470     for ($i = 0; $i < count($to); $i++) {
 471         fputs($smtpConnection, "RCPT TO: $to[$i]\r\n");
 472         $tmp = fgets($smtpConnection, 1024);
 473         if (errorCheck($tmp, $smtpConnection)!=5) return(0);
 474     }
 475     for ($i = 0; $i < count($cc); $i++) {
 476         fputs($smtpConnection, "RCPT TO: $cc[$i]\r\n");
 477         $tmp = fgets($smtpConnection, 1024);
 478         if (errorCheck($tmp, $smtpConnection)!=5) return(0);
 479     }
 480     for ($i = 0; $i < count($bcc); $i++) {
 481         fputs($smtpConnection, "RCPT TO: $bcc[$i]\r\n");
 482         $tmp = fgets($smtpConnection, 1024);
 483         if (errorCheck($tmp, $smtpConnection)!=5) return(0);
 484     }
 485
 486     /** Lets start sending the actual message */
 487     fputs($smtpConnection, "DATA\r\n");
 488     $tmp = fgets($smtpConnection, 1024);
 489     if (errorCheck($tmp, $smtpConnection)!=5) return(0);
 490
 491     // Send the message
 492     $headerlength = write822Header ($smtpConnection, $t, $c, $b, $subject, $more_headers);
 493     $bodylength = writeBody($smtpConnection, $body);
 494
 495     fputs($smtpConnection, ".\r\n"); // end the DATA part
 496     $tmp = fgets($smtpConnection, 1024);
 497     $num = errorCheck($tmp, $smtpConnection, true);
 498     if ($num != 250) {
 499         $tmp = nl2br(htmlspecialchars($tmp));
 500         displayPageHeader($color, 'None');
 501         include_once('../functions/display_messages.php');
 502         $msg  = "Message not sent!<br>\nReason given: $tmp";
 503         plain_error_message($msg, $color);
 504         return(0);
 505     }
 506
 507     fputs($smtpConnection, "QUIT\r\n"); // log off
 508
 509     fclose($smtpConnection);
 510
 511     return ($headerlength + $bodylength);
 512 }
 513
 514
 515 function errorCheck($line, $smtpConnection, $verbose = false) {
 516     global $color;
 517
 518     // Read new lines on a multiline response
 519     $lines = $line;
 520     while(ereg("^[0-9]+-", $line)) {
 521         $line = fgets($smtpConnection, 1024);
 522         $lines .= $line;
 523     }
 524
 525     // Status:  0 = fatal
 526     //          5 = ok
 527
 528     $err_num = substr($line, 0, strpos($line, " "));
 529     switch ($err_num) {
 530     case 500:   $message = 'Syntax error; command not recognized';
 531         $status = 0;
 532         break;
 533     case 501:   $message = 'Syntax error in parameters or arguments';
 534         $status = 0;
 535         break;
 536     case 502:   $message = 'Command not implemented';
 537         $status = 0;
 538         break;
 539     case 503:   $message = 'Bad sequence of commands';
 540         $status = 0;
 541         break;
 542     case 504:   $message = 'Command parameter not implemented';
 543         $status = 0;
 544         break;
 545
 546
 547     case 211:   $message = 'System status, or system help reply';
 548         $status = 5;
 549         break;
 550     case 214:   $message = 'Help message';
 551         $status = 5;
 552         break;
 553
 554
 555     case 220:   $message = 'Service ready';
 556         $status = 5;
 557         break;
 558     case 221:   $message = 'Service closing transmission channel';
 559         $status = 5;
 560         break;
 561     case 421:   $message = 'Service not available, closing chanel';
 562         $status = 0;
 563         break;
 564
 565     case 235:   return(5); break;
 566     case 250:   $message = 'Requested mail action okay, completed';
 567         $status = 5;
 568         break;
 569     case 251:   $message = 'User not local; will forward';
 570         $status = 5;
 571         break;
 572     case 334:   return(5); break;
 573     case 450:   $message = 'Requested mail action not taken:  mailbox unavailable';
 574         $status = 0;
 575         break;
 576     case 550:   $message = 'Requested action not taken:  mailbox unavailable';
 577         $status = 0;
 578         break;
 579     case 451:   $message = 'Requested action aborted:  error in processing';
 580         $status = 0;
 581         break;
 582     case 551:   $message = 'User not local; please try forwarding';
 583         $status = 0;
 584         break;
 585     case 452:   $message = 'Requested action not taken:  insufficient system storage';
 586         $status = 0;
 587         break;
 588     case 552:   $message = 'Requested mail action aborted:  exceeding storage allocation';
 589         $status = 0;
 590         break;
 591     case 553:   $message = 'Requested action not taken: mailbox name not allowed';
 592         $status = 0;
 593         break;
 594     case 354:   $message = 'Start mail input; end with .';
 595         $status = 5;
 596         break;
 597     case 554:   $message = 'Transaction failed';
 598         $status = 0;
 599         break;
 600     default:    $message = 'Unknown response: '. nl2br(htmlspecialchars($lines));
 601         $status = 0;
 602         $error_num = '001';
 603         break;
 604     }
 605
 606     if ($status == 0) {
 607         include_once('../functions/page_header.php');
 608         displayPageHeader($color, 'None');
 609         include_once('../functions/display_messages.php');
 610         $lines = nl2br(htmlspecialchars($lines));
 611         $msg  = $message . "<br>\nServer replied: $lines";
 612         plain_error_message($msg, $color);
 613     }
 614     if (! $verbose) return $status;
 615     return $err_num;
 616 }
 617
 618 function sendMessage($t, $c, $b, $subject, $body, $reply_id, $prio = 3) {
 619     global $useSendmail, $msg_id, $is_reply, $mailbox, $onetimepad;
 620     global $data_dir, $username, $domain, $key, $version, $sent_folder, $imapServerAddress, $imapPort;
 621     global $default_use_priority;
 622     global $more_headers;
 623     $more_headers = Array();
 624
 625     do_hook("smtp_send");
 626
 627     $imap_stream = sqimap_login($username, $key, $imapServerAddress, $imapPort, 1);
 628
 629     if (isset($reply_id) && $reply_id) {
 630         sqimap_mailbox_select ($imap_stream, $mailbox);
 631         sqimap_messages_flag ($imap_stream, $reply_id, $reply_id, 'Answered');
 632
 633         // Insert In-Reply-To and References headers if the
 634         // message-id of the message we reply to is set (longer than "<>")
 635         // The References header should really be the old Referenced header
 636         // with the message ID appended, but it can be only the message ID too.
 637         $hdr = sqimap_get_small_header ($imap_stream, $reply_id, false);
 638         if(strlen($hdr->message_id) > 2) {
 639             $more_headers['In-Reply-To'] = $hdr->message_id;
 640             $more_headers['References']  = $hdr->message_id;
 641         }
 642     }
 643     if ($default_use_priority) {
 644         $more_headers = array_merge($more_headers, createPriorityHeaders($prio));
 645     }
 646
 647     // In order to remove the problem of users not able to create
 648     // messages with "." on a blank line, RFC821 has made provision
 649     // in section 4.5.2 (Transparency).
 650     $body = ereg_replace("\n\\.", "\n..", $body);
 651     $body = ereg_replace("^\\.", "..", $body);
 652
 653     // this is to catch all plain \n instances and
 654     // replace them with \r\n.  All newlines were converted
 655     // into just \n inside the compose.php file.
 656     $body = ereg_replace("\n", "\r\n", $body);
 657
 658     if ($useSendmail) {
 659         $length = sendSendmail($t, $c, $b, $subject, $body, $more_headers);
 660     } else {
 661         $length = sendSMTP($t, $c, $b, $subject, $body, $more_headers);
 662     }
 663
 664     if (sqimap_mailbox_exists ($imap_stream, $sent_folder)) {
 665         sqimap_append ($imap_stream, $sent_folder, $length);
 666         write822Header ($imap_stream, $t, $c, $b, $subject, $more_headers);
 667         writeBody ($imap_stream, $body);
 668         sqimap_append_done ($imap_stream);
 669     }
 670     sqimap_logout($imap_stream);
 671     // Delete the files uploaded for attaching (if any).
 672     // only if $length != 0 (if there was no error)
 673     if ($length)
 674         ClearAttachments();
 675
 676     return $length;
 677 }
 678
 679 function createPriorityHeaders($prio) {
 680     $prio_headers = Array();
 681     $prio_headers["X-Priority"] = $prio;
 682
 683     switch($prio) {
 684     case 1: $prio_headers["Importance"] = "High";
 685         $prio_headers["X-MSMail-Priority"] = "High";
 686         break;
 687
 688     case 3: $prio_headers["Importance"] = "Normal";
 689         $prio_headers["X-MSMail-Priority"] = "Normal";
 690         break;
 691
 692     case 5:
 693         $prio_headers["Importance"] = "Low";
 694         $prio_headers["X-MSMail-Priority"] = "Low";
 695         break;
 696     }
 697     return  $prio_headers;
 698 }
 699
 700 ?>