PHP SMTP发送邮件函数

php代码

$bfconfig = Array (
    'sitename' => '网站名称',
    );

$mail = Array (
    'state' => 1,
    'server' => 'smtp.abc.com',
    'port' => 25,
    'auth' => 1,
    'username' => 'admin@abc.com',
    'password' => '123456',
    'charset' => 'gbk',
    'mailfrom' => 'admin@abc.com'
    );

function sendmail($mail_to, $mail_subject, $mail_message) {

    global $mail, $bfconfig;

    date_default_timezone_set('PRC');

    $mail_subject = '=?'.$mail['charset'].'?B?'.base64_encode($mail_subject).'?=';
    $mail_message = chunk_split(base64_encode(preg_replace("/(^|(\r\n))(\.)/", "\1.\3", $mail_message)));

    $headers .= "";
    $headers .= "MIME-Version:1.0\r\n";
    $headers .= "Content-type:text/html\r\n";
    $headers .= "Content-Transfer-Encoding: base64\r\n";
    $headers .= "From: ".$bfconfig[&#39;sitename&#39;]."<".$mail[&#39;mailfrom&#39;].">\r\n";
    $headers .= "Date: ".date("r")."\r\n";
    list($msec, $sec) = explode(" ", microtime());
    $headers .= "Message-ID: <".date("YmdHis", $sec).".".($msec * 1000000).".".$mail[&#39;mailfrom&#39;].">\r\n";

    if(!$fp = fsockopen($mail[&#39;server&#39;], $mail[&#39;port&#39;], $errno, $errstr, 30)) {
        exit("CONNECT - Unable to connect to the SMTP server");
    }

    stream_set_blocking($fp, true);

    $lastmessage = fgets($fp, 512);
    if(substr($lastmessage, 0, 3) != &#39;220&#39;) {
        exit("CONNECT - ".$lastmessage);
    }

    fputs($fp, ($mail[&#39;auth&#39;] ? &#39;EHLO&#39; : &#39;HELO&#39;)." befen\r\n");
    $lastmessage = fgets($fp, 512);
    if(substr($lastmessage, 0, 3) != 220 && substr($lastmessage, 0, 3) != 250) {
        exit("HELO/EHLO - ".$lastmessage);
    }

    while(1) {
        if(substr($lastmessage, 3, 1) != &#39;-&#39; || empty($lastmessage)) {
            break;
        }
        $lastmessage = fgets($fp, 512);
    }

    if($mail[&#39;auth&#39;]) {
        fputs($fp, "AUTH LOGIN\r\n");
        $lastmessage = fgets($fp, 512);
        if(substr($lastmessage, 0, 3) != 334) {
            exit($lastmessage);
        }

        fputs($fp, base64_encode($mail[&#39;username&#39;])."\r\n");
        $lastmessage = fgets($fp, 512);
        if(substr($lastmessage, 0, 3) != 334) {
            exit("AUTH LOGIN - ".$lastmessage);
        }

        fputs($fp, base64_encode($mail[&#39;password&#39;])."\r\n");
        $lastmessage = fgets($fp, 512);
        if(substr($lastmessage, 0, 3) != 235) {
            exit("AUTH LOGIN - ".$lastmessage);
        }

        $email_from = $mail[&#39;mailfrom&#39;];
    }

    fputs($fp, "MAIL FROM: <".preg_replace("/.*\<(.+?)\>.*/", "\\1", $email_from).">\r\n");
    $lastmessage = fgets($fp, 512);
    if(substr($lastmessage, 0, 3) != 250) {
        fputs($fp, "MAIL FROM: <".preg_replace("/.*\<(.+?)\>.*/", "\\1", $email_from).">\r\n");
        $lastmessage = fgets($fp, 512);
        if(substr($lastmessage, 0, 3) != 250) {
            exit("MAIL FROM - ".$lastmessage);
        }
    }

    foreach(explode(&#39;,&#39;, $mail_to) as $touser) {
        $touser = trim($touser);
        if($touser) {
            fputs($fp, "RCPT TO: <".preg_replace("/.*\<(.+?)\>.*/", "\\1", $touser).">\r\n");
            $lastmessage = fgets($fp, 512);
            if(substr($lastmessage, 0, 3) != 250) {
                fputs($fp, "RCPT TO: <".preg_replace("/.*\<(.+?)\>.*/", "\\1", $touser).">\r\n");
                $lastmessage = fgets($fp, 512);
                exit("RCPT TO - ".$lastmessage);
            }
        }
    }

    fputs($fp, "DATA\r\n");
    $lastmessage = fgets($fp, 512);
    if(substr($lastmessage, 0, 3) != 354) {
        exit("DATA - ".$lastmessage);
    }

    fputs($fp, $headers);
    fputs($fp, "To: ".$mail_to."\r\n");
    fputs($fp, "Subject: $mail_subject\r\n");
    fputs($fp, "\r\n\r\n");
    fputs($fp, "$mail_message\r\n.\r\n");
    $lastmessage = fgets($fp, 512);
    if(substr($lastmessage, 0, 3) != 250) {
        exit("END - ".$lastmessage);
    }

    fputs($fp, "QUIT\r\n");

}