functions/smtp.php

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