vendor_user/uc_client/lib/sendmail.inc.php

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<?php

/*
    [UCenter] (C)2001-2099 Comsenz Inc.
    This is NOT a freeware, use is subject to license terms

    $Id: sendmail.inc.php 1059 2011-03-01 07:25:09Z monkey $
*/

!defined('IN_UC') && exit('Access Denied');

if ($mail_setting['mailsilent']) {
    error_reporting(0);
}

$maildelimiter = 1 == $mail_setting['maildelimiter'] ? "\r\n" : (2 == $mail_setting['maildelimiter'] ? "\r" : "\n");
$mailusername = isset($mail_setting['mailusername']) ? $mail_setting['mailusername'] : 1;
$appname = $this->base->cache['apps'][$mail['appid']]['name'];
$mail['subject'] = '=?'.$mail['charset'].'?B?'.base64_encode(str_replace("\r", '', str_replace("\n", '', '['.$appname.'] '.$mail['subject']))).'?=';
$mail['message'] = chunk_split(base64_encode(str_replace("\r\n.", " \r\n..", str_replace("\n", "\r\n", str_replace("\r", "\n", str_replace("\r\n", "\n", str_replace("\n\r", "\r", $mail['message'])))))));

$email_from = '' == $mail['frommail'] ? '=?'.$mail['charset'].'?B?'.base64_encode($appname)."?= <$mail_setting[maildefault]>" : (preg_match('/^(.+?) \<(.+?)\>$/', $email_from, $from) ? '=?'.$mail['charset'].'?B?'.base64_encode($from[1])."?= <$from[2]>" : $mail['frommail']);

foreach (explode(',', $mail['email_to']) as $touser) {
    $tousers[] = preg_match('/^(.+?) \<(.+?)\>$/', $touser, $to) ? ($mailusername ? '=?'.$mail['charset'].'?B?'.base64_encode($to[1])."?= <$to[2]>" : $to[2]) : $touser;
}

$mail['email_to'] = implode(',', $tousers);

$headers = "From: $email_from{$maildelimiter}X-Priority: 3{$maildelimiter}X-Mailer: Discuz! $version{$maildelimiter}MIME-Version: 1.0{$maildelimiter}Content-type: text/".($mail['htmlon'] ? 'html' : 'plain')."; charset=$mail[charset]{$maildelimiter}Content-Transfer-Encoding: base64{$maildelimiter}";

$mail_setting['mailport'] = $mail_setting['mailport'] ? $mail_setting['mailport'] : 25;

if (1 == $mail_setting['mailsend'] && function_exists('mail')) {
    return @mail($mail['email_to'], $mail['subject'], $mail['message'], $headers);
} elseif (2 == $mail_setting['mailsend']) {
    if (!$fp = fsockopen($mail_setting['mailserver'], $mail_setting['mailport'], $errno, $errstr, 30)) {
        return false;
    }

    stream_set_blocking($fp, true);

    $lastmessage = fgets($fp, 512);
    if ('220' != substr($lastmessage, 0, 3)) {
        return false;
    }

    fputs($fp, ($mail_setting['mailauth'] ? 'EHLO' : 'HELO')." discuz\r\n");
    $lastmessage = fgets($fp, 512);
    if (220 != substr($lastmessage, 0, 3) && 250 != substr($lastmessage, 0, 3)) {
        return false;
    }

    while (1) {
        if ('-' != substr($lastmessage, 3, 1) || empty($lastmessage)) {
            break;
        }
        $lastmessage = fgets($fp, 512);
    }