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 require_once('../functions/addressbook.php');
  16 require_once('../functions/plugin.php');
  17 require_once('../functions/prefs.php');
  18
  19 global $username, $popuser, $domain;
  20
  21 /* This should most probably go to some initialization... */
  22 if (ereg("^([^@%/]+)[@%/](.+)$", $username, $usernamedata)) {
  23     $popuser = $usernamedata[1];
  24     $domain  = $usernamedata[2];
  25     unset($usernamedata);
  26 } else {
  27     $popuser = $username;
  28 }
  29 /* We need domain for smtp */
  30 if (!$domain) {
  31     $domain = getenv('HOSTNAME');
  32 }
  33
  34 /* Returns true only if this message is multipart */
  35 function isMultipart () {
  36     global $attachments;
  37
  38     if (count($attachments)>0) {
  39         return true;
  40     }
  41     else {
  42         return false;
  43     }
  44 }
  45
  46 /* looks up aliases in the addressbook and expands them to
  47  * the full address.
  48  *
  49  * Adds @$domain if it wasn't in the address book and if it
  50  * doesn't have an @ symbol in it
  51  */
  52 function expandAddrs ($array) {
  53     global $domain;
  54
  55     /* don't show errors -- kinda critical that we don't see
  56      * them here since the redirect won't work if we do show them
  57      */
  58     $abook = addressbook_init(false);
  59     for ($i=0; $i < count($array); $i++) {
  60         $result = $abook->lookup($array[$i]);
  61         $ret = "";
  62         if (isset($result['email'])) {
  63             if (isset($result['name'])) {
  64                 $ret = '"'.$result['name'].'" ';
  65             }
  66             $ret .= '<'.$result['email'].'>';
  67             $array[$i] = $ret;
  68         }
  69         else
  70         {
  71             if (strpos($array[$i], '@') === false) {
  72                 $array[$i] .= '@' . $domain;
  73             }
  74             $array[$i] = '<' . $array[$i] . '>';
  75         }
  76     }
  77     return $array;
  78 }
  79
  80
  81 /* looks up aliases in the addressbook and expands them to
  82  * the RFC 821 valid RCPT address. ie <user@example.com>
  83  * Adds @$domain if it wasn't in the address book and if it
  84  * doesn't have an @ symbol in it
  85  */
  86 function expandRcptAddrs ($array) {
  87     global $domain;
  88
  89     /* don't show errors -- kinda critical that we don't see
  90      * them here since the redirect won't work if we do show them
  91      */
  92     $abook = addressbook_init(false);
  93     for ($i=0; $i < count($array); $i++) {
  94         $result = $abook->lookup($array[$i]);
  95         $ret = "";
  96         if (isset($result['email'])) {
  97             $ret = '<'.$result['email'].'>';
  98             $array[$i] = $ret;
  99         }
 100         else {
 101             if (strpos($array[$i], '@') === false) {
 102                 $array[$i] .= '@' . $domain;
 103             }
 104             $array[$i] = '<' . $array[$i] . '>';
 105         }
 106     }
 107     return $array;
 108 }
 109
 110
 111 /* Attach the files that are due to be attached
 112  */
 113 function attachFiles ($fp) {
 114     global $attachments, $attachment_dir, $username;
 115
 116     $length = 0;
 117
 118     $hashed_attachment_dir = getHashedDir($username, $attachment_dir);
 119     if (isMultipart()) {
 120         foreach ($attachments as $info) {
 121             if (isset($info['type'])) {
 122                 $filetype = $info['type'];
 123             }
 124             else {
 125                 $filetype = 'application/octet-stream';
 126             }
 127
 128             $header = '--'.mimeBoundary()."\r\n";
 129             $header .= "Content-Type: $filetype; name=\"" .
 130                 $info['remotefilename'] . "\"\r\n";
 131             $header .= "Content-Disposition: attachment; filename=\"" .
 132                 $info['remotefilename'] . "\"\r\n";
 133
 134             /* Use 'rb' for NT systems -- read binary
 135              * Unix doesn't care -- everything's binary!  :-)
 136              */
 137
 138             $filename = $hashed_attachment_dir . '/' . $info['localfilename'];
 139             $file = fopen ($filename, 'rb');
 140             if (substr($filetype, 0, 5) == 'text/' ||
 141                 $filetype == 'message/rfc822') {
 142                 $header .= "\r\n";
 143                 fputs ($fp, $header);
 144                 $length += strlen($header);
 145                 while ($tmp = fgets($file, 4096)) {
 146                     $tmp = str_replace("\r\n", "\n", $tmp);
 147                     $tmp = str_replace("\r", "\n", $tmp);
 148                     $tmp = str_replace("\n", "\r\n", $tmp);
 149                     if (feof($fp) && substr($tmp, -2) != "\r\n") {
 150                         $tmp .= "\r\n";
 151                     }
 152                     fputs($fp, $tmp);
 153                     $length += strlen($tmp);
 154                 }
 155             } else {
 156                 $header .= "Content-Transfer-Encoding: base64\r\n\r\n";
 157                 fputs ($fp, $header);
 158                 $length += strlen($header);
 159                 while ($tmp = fread($file, 570)) {
 160                     $encoded = chunk_split(base64_encode($tmp));
 161                     $length += strlen($encoded);
 162                     fputs ($fp, $encoded);
 163                 }
 164             }
 165             fclose ($file);
 166         }
 167     }
 168     return $length;
 169 }
 170
 171 /* Delete files that are uploaded for attaching
 172  */
 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  */
 191 function mimeBoundary () {
 192     static $mimeBoundaryString;
 193
 194     if ($mimeBoundaryString == "") {
 195         $mimeBoundaryString = "----=_" .
 196             GenerateRandomString(60, '\'()+,-./:=?_', 7);
 197     }
 198
 199     return $mimeBoundaryString;
 200 }
 201
 202 /* Time offset for correct timezone */
 203 function timezone () {
 204     global $invert_time;
 205
 206     $diff_second = date('Z');
 207     if ($invert_time) {
 208         $diff_second = - $diff_second;
 209     }
 210     if ($diff_second > 0) {
 211         $sign = '+';
 212     }
 213     else {
 214         $sign = '-';
 215     }
 216
 217     $diff_second = abs($diff_second);
 218
 219     $diff_hour = floor ($diff_second / 3600);
 220     $diff_minute = floor (($diff_second-3600*$diff_hour) / 60);
 221
 222     $zonename = '('.strftime('%Z').')';
 223     $result = sprintf ("%s%02d%02d %s", $sign, $diff_hour, $diff_minute, $zonename);
 224     return ($result);
 225 }
 226
 227 /* Print all the needed RFC822 headers */
 228 function write822Header ($fp, $t, $c, $b, $subject, $more_headers) {
 229     global $REMOTE_ADDR, $SERVER_NAME, $REMOTE_PORT;
 230     global $data_dir, $username, $popuser, $domain, $version, $useSendmail;
 231     global $default_charset, $HTTP_VIA, $HTTP_X_FORWARDED_FOR;
 232     global $REMOTE_HOST, $identity;
 233
 234     /* Storing the header to make sure the header is the same
 235      * everytime the header is printed.
 236      */
 237     static $header, $headerlength;
 238
 239     if ($header == '') {
 240         $to = expandAddrs(parseAddrs($t));
 241         $cc = expandAddrs(parseAddrs($c));
 242         $bcc = expandAddrs(parseAddrs($b));
 243         if (isset($identity) && $identity != 'default') {
 244             $reply_to = getPref($data_dir, $username, 'reply_to' . $identity);
 245             $from = getPref($data_dir, $username, 'full_name' . $identity);
 246             $from_addr = getPref($data_dir, $username, 'email_address' . $identity);
 247         } else {
 248             $reply_to = getPref($data_dir, $username, 'reply_to');
 249             $from = getPref($data_dir, $username, 'full_name');
 250             $from_addr = getPref($data_dir, $username, 'email_address');
 251         }
 252
 253         if ($from_addr == '') {
 254             $from_addr = $popuser.'@'.$domain;
 255         }
 256
 257         $to_list = getLineOfAddrs($to);
 258         $cc_list = getLineOfAddrs($cc);
 259         $bcc_list = getLineOfAddrs($bcc);
 260
 261         /* Encoding 8-bit characters and making from line */
 262         $subject = encodeHeader($subject);
 263         if ($from == '') {
 264             $from = "<$from_addr>";
 265         }
 266         else {
 267             $from = '"' . encodeHeader($from) . "\" <$from_addr>";
 268         }
 269
 270         /* This creates an RFC 822 date */
 271         $date = date("D, j M Y H:i:s ", mktime()) . timezone();
 272
 273         /* Create a message-id */
 274         $message_id = '<' . $REMOTE_PORT . '.' . $REMOTE_ADDR . '.';
 275         $message_id .= time() . '.squirrel@' . $SERVER_NAME .'>';
 276
 277         /* Make an RFC822 Received: line */
 278         if (isset($REMOTE_HOST)) {
 279             $received_from = "$REMOTE_HOST ([$REMOTE_ADDR])";
 280         }
 281         else {
 282             $received_from = $REMOTE_ADDR;
 283         }
 284
 285         if (isset($HTTP_VIA) || isset ($HTTP_X_FORWARDED_FOR)) {
 286             if ($HTTP_X_FORWARDED_FOR == '') {
 287                 $HTTP_X_FORWARDED_FOR = 'unknown';
 288             }
 289             $received_from .= " (proxying for $HTTP_X_FORWARDED_FOR)";
 290         }
 291
 292         $header  = "Received: from $received_from\r\n";
 293         $header .= "        (SquirrelMail authenticated user $username)\r\n";
 294         $header .= "        by $SERVER_NAME with HTTP;\r\n";
 295         $header .= "        $date\r\n";
 296
 297         /* Insert the rest of the header fields */
 298         $header .= "Message-ID: $message_id\r\n";
 299         $header .= "Date: $date\r\n";
 300         $header .= "Subject: $subject\r\n";
 301         $header .= "From: $from\r\n";
 302         $header .= "To: $to_list\r\n";    // Who it's TO
 303
 304         /* Insert headers from the $more_headers array */
 305         if(is_array($more_headers)) {
 306             reset($more_headers);
 307             while(list($h_name, $h_val) = each($more_headers)) {
 308                 $header .= sprintf("%s: %s\r\n", $h_name, $h_val);
 309             }
 310         }
 311
 312         if ($cc_list) {
 313             $header .= "Cc: $cc_list\r\n"; // Who the CCs are
 314         }
 315
 316         if ($reply_to != '') {
 317             $header .= "Reply-To: $reply_to\r\n";
 318         }
 319
 320         if ($useSendmail) {
 321             if ($bcc_list) {
 322                 // BCCs is removed from header by sendmail
 323                 $header .= "Bcc: $bcc_list\r\n";
 324             }
 325         }
 326
 327         $header .= "X-Mailer: SquirrelMail (version $version)\r\n"; /* Identify SquirrelMail */
 328
 329         /* Do the MIME-stuff */
 330         $header .= "MIME-Version: 1.0\r\n";
 331
 332         if (isMultipart()) {
 333             $header .= 'Content-Type: multipart/mixed; boundary="';
 334             $header .= mimeBoundary();
 335             $header .= "\"\r\n";
 336         } else {
 337             if ($default_charset != '') {
 338                 $header .= "Content-Type: text/plain; charset=$default_charset\r\n";
 339             }
 340             else {
 341                 $header .= "Content-Type: text/plain;\r\n";
 342             }
 343             $header .= "Content-Transfer-Encoding: 8bit\r\n";
 344         }
 345         $header .= "\r\n"; // One blank line to separate header and body
 346
 347         $headerlength = strlen($header);
 348     }
 349
 350     /* Write the header */
 351     fputs ($fp, $header);
 352
 353     return $headerlength;
 354 }
 355
 356 /* Send the body
 357  */
 358 function writeBody ($fp, $passedBody) {
 359     global $default_charset;
 360
 361     $attachmentlength = 0;
 362
 363     if (isMultipart()) {
 364         $body = '--'.mimeBoundary()."\r\n";
 365
 366         if ($default_charset != "") {
 367             $body .= "Content-Type: text/plain; charset=$default_charset\r\n";
 368         }
 369         else {
 370             $body .= "Content-Type: text/plain\r\n";
 371         }
 372
 373         $body .= "Content-Transfer-Encoding: 8bit\r\n\r\n";
 374         $body .= $passedBody . "\r\n\r\n";
 375         fputs ($fp, $body);
 376
 377         $attachmentlength = attachFiles($fp);
 378
 379         if (!isset($postbody)) {
 380             $postbody = "";
 381         }
 382         $postbody .= "\r\n--".mimeBoundary()."--\r\n\r\n";
 383         fputs ($fp, $postbody);
 384     } else {
 385         $body = $passedBody . "\r\n";
 386         fputs ($fp, $body);
 387         $postbody = "\r\n";
 388         fputs ($fp, $postbody);
 389     }
 390
 391     return (strlen($body) + strlen($postbody) + $attachmentlength);
 392 }
 393
 394 /* Send mail using the sendmail command
 395  */
 396 function sendSendmail($t, $c, $b, $subject, $body, $more_headers) {
 397     global $sendmail_path, $popuser, $username, $domain;
 398
 399     /* Build envelope sender address. Make sure it doesn't contain
 400      * spaces or other "weird" chars that would allow a user to
 401      * exploit the shell/pipe it is used in.
 402      */
 403     $envelopefrom = "$popuser@$domain";
 404     $envelopefrom = ereg_replace("[[:blank:]]",'', $envelopefrom);
 405     $envelopefrom = ereg_replace("[[:space:]]",'', $envelopefrom);
 406     $envelopefrom = ereg_replace("[[:cntrl:]]",'', $envelopefrom);
 407
 408     /* open pipe to sendmail or qmail-inject (qmail-inject doesn't accept -t param) */
 409     if (strstr($sendmail_path, "qmail-inject")) {
 410         $fp = popen (escapeshellcmd("$sendmail_path -f$envelopefrom"), "w");
 411     } else {
 412         $fp = popen (escapeshellcmd("$sendmail_path -t -f$envelopefrom"), "w");
 413     }
 414
 415     $headerlength = write822Header ($fp, $t, $c, $b, $subject, $more_headers);
 416     $bodylength = writeBody($fp, $body);
 417
 418     pclose($fp);
 419
 420     return ($headerlength + $bodylength);
 421 }
 422
 423 function smtpReadData($smtpConnection) {
 424     $read = fgets($smtpConnection, 1024);
 425     $counter = 0;
 426     while ($read) {
 427         echo $read . '<BR>';
 428         $data[$counter] = $read;
 429         $read = fgets($smtpConnection, 1024);
 430         $counter++;
 431     }
 432 }
 433
 434 function sendSMTP($t, $c, $b, $subject, $body, $more_headers) {
 435     global $username, $popuser, $domain, $version, $smtpServerAddress,
 436         $smtpPort, $data_dir, $color, $use_authenticated_smtp, $identity,
 437         $key, $onetimepad;
 438
 439     $to = expandRcptAddrs(parseAddrs($t));
 440     $cc = expandRcptAddrs(parseAddrs($c));
 441     $bcc = expandRcptAddrs(parseAddrs($b));
 442     if (isset($identity) && $identity != 'default') {
 443         $from_addr = getPref($data_dir, $username, 'email_address' . $identity);
 444     }
 445     else {
 446         $from_addr = getPref($data_dir, $username, 'email_address');
 447     }
 448
 449     if (!$from_addr) {
 450         $from_addr = "$popuser@$domain";
 451     }
 452
 453     $smtpConnection = fsockopen($smtpServerAddress, $smtpPort, $errorNumber, $errorString);
 454     if (!$smtpConnection) {
 455         echo 'Error connecting to SMTP Server.<br>';
 456         echo "$errorNumber : $errorString<br>";
 457         exit;
 458     }
 459     $tmp = fgets($smtpConnection, 1024);
 460     if (errorCheck($tmp, $smtpConnection)!=5) return(0);
 461
 462     $to_list = getLineOfAddrs($to);
 463     $cc_list = getLineOfAddrs($cc);
 464
 465     /* Lets introduce ourselves */
 466     if (! isset ($use_authenticated_smtp) || $use_authenticated_smtp == false) {
 467         fputs($smtpConnection, "HELO $domain\r\n");
 468         $tmp = fgets($smtpConnection, 1024);
 469         if (errorCheck($tmp, $smtpConnection)!=5) return(0);
 470     } else {
 471         fputs($smtpConnection, "EHLO $domain\r\n");
 472         $tmp = fgets($smtpConnection, 1024);
 473         if (errorCheck($tmp, $smtpConnection)!=5) return(0);
 474
 475         fputs($smtpConnection, "AUTH LOGIN\r\n");
 476         $tmp = fgets($smtpConnection, 1024);
 477         if (errorCheck($tmp, $smtpConnection)!=5) {
 478             return(0);
 479         }
 480
 481         fputs($smtpConnection, base64_encode ($username) . "\r\n");
 482         $tmp = fgets($smtpConnection, 1024);
 483         if (errorCheck($tmp, $smtpConnection)!=5) {
 484             return(0);
 485         }
 486
 487         fputs($smtpConnection, base64_encode (OneTimePadDecrypt($key, $onetimepad)) . "\r\n");
 488         $tmp = fgets($smtpConnection, 1024);
 489         if (errorCheck($tmp, $smtpConnection)!=5) {
 490             return(0);
 491         }
 492     }
 493
 494     /* Ok, who is sending the message? */
 495     fputs($smtpConnection, "MAIL FROM: <$from_addr>\r\n");
 496     $tmp = fgets($smtpConnection, 1024);
 497     if (errorCheck($tmp, $smtpConnection)!=5) {
 498         return(0);
 499     }
 500
 501     /* send who the recipients are */
 502     for ($i = 0; $i < count($to); $i++) {
 503         fputs($smtpConnection, "RCPT TO: $to[$i]\r\n");
 504         $tmp = fgets($smtpConnection, 1024);
 505         if (errorCheck($tmp, $smtpConnection)!=5) {
 506             return(0);
 507         }
 508     }
 509     for ($i = 0; $i < count($cc); $i++) {
 510         fputs($smtpConnection, "RCPT TO: $cc[$i]\r\n");
 511         $tmp = fgets($smtpConnection, 1024);
 512         if (errorCheck($tmp, $smtpConnection)!=5) {
 513             return(0);
 514         }
 515     }
 516     for ($i = 0; $i < count($bcc); $i++) {
 517         fputs($smtpConnection, "RCPT TO: $bcc[$i]\r\n");
 518         $tmp = fgets($smtpConnection, 1024);
 519         if (errorCheck($tmp, $smtpConnection)!=5) {
 520             return(0);
 521         }
 522     }
 523
 524     /* Lets start sending the actual message */
 525     fputs($smtpConnection, "DATA\r\n");
 526     $tmp = fgets($smtpConnection, 1024);
 527     if (errorCheck($tmp, $smtpConnection)!=5) {
 528         return(0);
 529     }
 530
 531     /* Send the message */
 532     $headerlength = write822Header ($smtpConnection, $t, $c, $b, $subject, $more_headers);
 533     $bodylength = writeBody($smtpConnection, $body);
 534
 535     fputs($smtpConnection, ".\r\n"); /* end the DATA part */
 536     $tmp = fgets($smtpConnection, 1024);
 537     $num = errorCheck($tmp, $smtpConnection, true);
 538     if ($num != 250) {
 539         $tmp = nl2br(htmlspecialchars($tmp));
 540         displayPageHeader($color, 'None');
 541         include_once('../functions/display_messages.php');
 542         $msg  = "Message not sent!<br>\nReason given: $tmp";
 543         plain_error_message($msg, $color);
 544         return(0);
 545     }
 546
 547     fputs($smtpConnection, "QUIT\r\n"); /* log off */
 548
 549     fclose($smtpConnection);
 550
 551     return ($headerlength + $bodylength);
 552 }
 553
 554
 555 function errorCheck($line, $smtpConnection, $verbose = false) {
 556     global $color;
 557
 558     /* Read new lines on a multiline response */
 559     $lines = $line;
 560     while(ereg("^[0-9]+-", $line)) {
 561         $line = fgets($smtpConnection, 1024);
 562         $lines .= $line;
 563     }
 564
 565     /* Status:  0 = fatal
 566      *          5 = ok
 567      */
 568     $err_num = substr($line, 0, strpos($line, " "));
 569     switch ($err_num) {
 570     case 500:   $message = 'Syntax error; command not recognized';
 571         $status = 0;
 572         break;
 573     case 501:   $message = 'Syntax error in parameters or arguments';
 574         $status = 0;
 575         break;
 576     case 502:   $message = 'Command not implemented';
 577         $status = 0;
 578         break;
 579     case 503:   $message = 'Bad sequence of commands';
 580         $status = 0;
 581         break;
 582     case 504:   $message = 'Command parameter not implemented';
 583         $status = 0;
 584         break;
 585
 586     case 211:   $message = 'System status, or system help reply';
 587         $status = 5;
 588         break;
 589     case 214:   $message = 'Help message';
 590         $status = 5;
 591         break;
 592
 593     case 220:   $message = 'Service ready';
 594         $status = 5;
 595         break;
 596     case 221:   $message = 'Service closing transmission channel';
 597         $status = 5;
 598         break;
 599
 600     case 421:   $message = 'Service not available, closing chanel';
 601         $status = 0;
 602         break;
 603
 604     case 235:   return(5);
 605         break;
 606     case 250:   $message = 'Requested mail action okay, completed';
 607         $status = 5;
 608         break;
 609     case 251:   $message = 'User not local; will forward';
 610         $status = 5;
 611         break;
 612     case 334:   return(5); break;
 613     case 450:   $message = 'Requested mail action not taken:  mailbox unavailable';
 614         $status = 0;
 615         break;
 616     case 550:   $message = 'Requested action not taken:  mailbox unavailable';
 617         $status = 0;
 618         break;
 619     case 451:   $message = 'Requested action aborted:  error in processing';
 620         $status = 0;
 621         break;
 622     case 551:   $message = 'User not local; please try forwarding';
 623         $status = 0;
 624         break;
 625     case 452:   $message = 'Requested action not taken:  insufficient system storage';
 626         $status = 0;
 627         break;
 628     case 552:   $message = 'Requested mail action aborted:  exceeding storage allocation';
 629         $status = 0;
 630         break;
 631     case 553:   $message = 'Requested action not taken: mailbox name not allowed';
 632         $status = 0;
 633         break;
 634     case 354:   $message = 'Start mail input; end with .';
 635         $status = 5;
 636         break;
 637     case 554:   $message = 'Transaction failed';
 638         $status = 0;
 639         break;
 640     default:    $message = 'Unknown response: '. nl2br(htmlspecialchars($lines));
 641         $status = 0;
 642         $error_num = '001';
 643         break;
 644     }
 645
 646     if ($status == 0) {
 647         include_once('../functions/page_header.php');
 648         displayPageHeader($color, 'None');
 649         include_once('../functions/display_messages.php');
 650         $lines = nl2br(htmlspecialchars($lines));
 651         $msg  = $message . "<br>\nServer replied: $lines";
 652         plain_error_message($msg, $color);
 653     }
 654     if (! $verbose) return $status;
 655     return $err_num;
 656 }
 657
 658 function sendMessage($t, $c, $b, $subject, $body, $reply_id, $prio = 3) {
 659     global $useSendmail, $msg_id, $is_reply, $mailbox, $onetimepad;
 660     global $data_dir, $username, $domain, $key, $version, $sent_folder, $imapServerAddress, $imapPort;
 661     global $default_use_priority;
 662     global $more_headers;
 663     $more_headers = Array();
 664
 665     do_hook("smtp_send");
 666
 667     $imap_stream = sqimap_login($username, $key, $imapServerAddress, $imapPort, 1);
 668
 669     if (isset($reply_id) && $reply_id) {
 670         sqimap_mailbox_select ($imap_stream, $mailbox);
 671         sqimap_messages_flag ($imap_stream, $reply_id, $reply_id, 'Answered');
 672
 673         /* Insert In-Reply-To and References headers if the
 674          * message-id of the message we reply to is set (longer than "<>")
 675          * The References header should really be the old Referenced header
 676          * with the message ID appended, but it can be only the message ID too.
 677          */
 678         $hdr = sqimap_get_small_header ($imap_stream, $reply_id, false);
 679         if(strlen($hdr->message_id) > 2) {
 680             $more_headers['In-Reply-To'] = $hdr->message_id;
 681             $more_headers['References']  = $hdr->message_id;
 682         }
 683     }
 684     if ($default_use_priority) {
 685         $more_headers = array_merge($more_headers, createPriorityHeaders($prio));
 686     }
 687
 688     /* In order to remove the problem of users not able to create
 689      * messages with "." on a blank line, RFC821 has made provision
 690      * in section 4.5.2 (Transparency).
 691      */
 692     $body = ereg_replace("\n\\.", "\n..", $body);
 693     $body = ereg_replace("^\\.", "..", $body);
 694
 695     /* this is to catch all plain \n instances and
 696      * replace them with \r\n.  All newlines were converted
 697      * into just \n inside the compose.php file.
 698      */
 699     $body = ereg_replace("\n", "\r\n", $body);
 700
 701     if ($useSendmail) {
 702         $length = sendSendmail($t, $c, $b, $subject, $body, $more_headers);
 703     } else {
 704         $length = sendSMTP($t, $c, $b, $subject, $body, $more_headers);
 705     }
 706
 707     if (sqimap_mailbox_exists ($imap_stream, $sent_folder)) {
 708         sqimap_append ($imap_stream, $sent_folder, $length);
 709         write822Header ($imap_stream, $t, $c, $b, $subject, $more_headers);
 710         writeBody ($imap_stream, $body);
 711         sqimap_append_done ($imap_stream);
 712     }
 713     sqimap_logout($imap_stream);
 714     /* Delete the files uploaded for attaching (if any).
 715      * only if $length != 0 (if there was no error)
 716      */
 717     if ($length)
 718         ClearAttachments();
 719
 720     return $length;
 721 }
 722
 723 function createPriorityHeaders($prio) {
 724     $prio_headers = Array();
 725     $prio_headers["X-Priority"] = $prio;
 726
 727     switch($prio) {
 728     case 1: $prio_headers["Importance"] = "High";
 729         $prio_headers["X-MSMail-Priority"] = "High";
 730         break;
 731
 732     case 3: $prio_headers["Importance"] = "Normal";
 733         $prio_headers["X-MSMail-Priority"] = "Normal";
 734         break;
 735
 736     case 5:
 737         $prio_headers["Importance"] = "Low";
 738         $prio_headers["X-MSMail-Priority"] = "Low";
 739         break;
 740     }
 741     return  $prio_headers;
 742 }
 743
 744 ?>