functions/smtp.php

   1 <?php
   2
   3 /**
   4  * smtp.php
   5  *
   6  * Copyright (c) 1999-2001 The SquirrelMail Development 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
  34 global $username, $popuser, $domain;
  35
  36    // This should most probably go to some initialization...
  37    if (ereg("^([^@%/]+)[@%/](.+)$", $username, $usernamedata)) {
  38       $popuser = $usernamedata[1];
  39       $domain  = $usernamedata[2];
  40       unset($usernamedata);
  41    } else {
  42       $popuser = $username;
  43    }
  44    // We need domain for smtp
  45    if (!$domain)
  46       $domain = getenv('HOSTNAME');
  47
  48    // Returns true only if this message is multipart
  49    function isMultipart () {
  50       global $attachments;
  51
  52       if (count($attachments)>0)
  53          return true;
  54       else
  55          return false;
  56    }
  57
  58    // looks up aliases in the addressbook and expands them to
  59    // the full address.
  60    // Adds @$domain if it wasn't in the address book and if it
  61    // doesn't have an @ symbol in it
  62    function expandAddrs ($array) {
  63       global $domain;
  64
  65       // don't show errors -- kinda critical that we don't see
  66       // them here since the redirect won't work if we do show them
  67       $abook = addressbook_init(false);
  68       for ($i=0; $i < count($array); $i++) {
  69          $result = $abook->lookup($array[$i]);
  70          $ret = "";
  71          if (isset($result['email'])) {
  72             if (isset($result['name'])) {
  73                $ret = '"'.$result['name'].'" ';
  74             }
  75             $ret .= '<'.$result['email'].'>';
  76             $array[$i] = $ret;
  77          }
  78          else
  79          {
  80             if (strpos($array[$i], '@') === false)
  81                $array[$i] .= '@' . $domain;
  82             $array[$i] = '<' . $array[$i] . '>';
  83          }
  84       }
  85       return $array;
  86    }
  87
  88
  89    // looks up aliases in the addressbook and expands them to
  90    // the RFC 821 valid RCPT address. ie <user@example.com>
  91    // Adds @$domain if it wasn't in the address book and if it
  92    // doesn't have an @ symbol in it
  93    function expandRcptAddrs ($array) {
  94       global $domain;
  95
  96       // don't show errors -- kinda critical that we don't see
  97       // them here since the redirect won't work if we do show them
  98       $abook = addressbook_init(false);
  99       for ($i=0; $i < count($array); $i++) {
 100          $result = $abook->lookup($array[$i]);
 101          $ret = "";
 102          if (isset($result['email'])) {
 103             $ret = '<'.$result['email'].'>';
 104             $array[$i] = $ret;
 105          }
 106          else
 107          {
 108             if (strpos($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;
 120
 121       $length = 0;
 122
 123       if (isMultipart()) {
 124          foreach ($attachments as $info)
 125          {
 126             if (isset($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             $file = fopen ($attachment_dir . $info['localfilename'], 'rb');
 140             if (substr($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                      $tmp .= "\r\n";
 151                   fputs($fp, $tmp);
 152                   $length += strlen($tmp);
 153                }
 154             } else {
 155                $header .= "Content-Transfer-Encoding: base64\r\n\r\n";
 156                fputs ($fp, $header);
 157                $length += strlen($header);
 158                while ($tmp = fread($file, 570)) {
 159                   $encoded = chunk_split(base64_encode($tmp));
 160                   $length += strlen($encoded);
 161                   fputs ($fp, $encoded);
 162                }
 163             }
 164             fclose ($file);
 165          }
 166       }
 167
 168       return $length;
 169    }
 170
 171    // Delete files that are uploaded for attaching
 172    function deleteAttachments() {
 173       global $attachments, $attachment_dir;
 174
 175       if (isMultipart()) {
 176          reset($attachments);
 177          while (list($localname, $remotename) = each($attachments)) {
 178             if (!ereg ("\\/", $localname)) {
 179                unlink ($attachment_dir.$localname);
 180                unlink ($attachment_dir.$localname.'.info');
 181             }
 182          }
 183       }
 184    }
 185
 186    // Return a nice MIME-boundary
 187    function mimeBoundary () {
 188       static $mimeBoundaryString;
 189
 190       if ($mimeBoundaryString == "") {
 191          $mimeBoundaryString = "----=_" .
 192              GenerateRandomString(60, '\'()+,-./:=?_', 7);
 193       }
 194
 195       return $mimeBoundaryString;
 196    }
 197
 198    /* Time offset for correct timezone */
 199    function timezone () {
 200       global $invert_time;
 201
 202       $diff_second = date('Z');
 203       if ($invert_time)
 204           $diff_second = - $diff_second;
 205       if ($diff_second > 0)
 206          $sign = '+';
 207       else
 208          $sign = '-';
 209
 210       $diff_second = abs($diff_second);
 211
 212       $diff_hour = floor ($diff_second / 3600);
 213       $diff_minute = floor (($diff_second-3600*$diff_hour) / 60);
 214
 215       $zonename = '('.strftime('%Z').')';
 216       $result = sprintf ("%s%02d%02d %s", $sign, $diff_hour, $diff_minute, $zonename);
 217       return ($result);
 218    }
 219
 220    /* Print all the needed RFC822 headers */
 221    function write822Header ($fp, $t, $c, $b, $subject, $more_headers) {
 222       global $REMOTE_ADDR, $SERVER_NAME, $REMOTE_PORT;
 223       global $data_dir, $username, $popuser, $domain, $version, $useSendmail;
 224       global $default_charset, $HTTP_VIA, $HTTP_X_FORWARDED_FOR;
 225       global $REMOTE_HOST, $identity;
 226
 227       // Storing the header to make sure the header is the same
 228       // everytime the header is printed.
 229       static $header, $headerlength;
 230
 231       if ($header == '') {
 232          $to = expandAddrs(parseAddrs($t));
 233          $cc = expandAddrs(parseAddrs($c));
 234          $bcc = expandAddrs(parseAddrs($b));
 235          if (isset($identity) && $identity != 'default')
 236          {
 237             $reply_to = getPref($data_dir, $username, 'reply_to' . $identity);
 238             $from = getPref($data_dir, $username, 'full_name' . $identity);
 239             $from_addr = getPref($data_dir, $username, 'email_address' . $identity);
 240          }
 241          else
 242          {
 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 ?>