php smtp发送邮件功能

<?php
header("Content-Type: text/html; charset=utf-8");

class smtp
{
    /* Public Variables */
    var $smtp_port;
    var $time_out;
    var $host_name;
    var $log_file;
    var $relay_host;
    var $debug;
    var $auth;
    var $user;
    var $pass; 

    /* Private Variables */
    var $sock; 

    /* Constractor */
    function smtp($relay_host = "", $smtp_port = 25,$auth = false,$user,$pass)
    {
        $this->debug = FALSE;
        $this->smtp_port = $smtp_port;
        $this->relay_host = $relay_host;
        $this->time_out = 30; //is used in fsockopen()
        $this->auth = $auth;//auth
        $this->user = $user;
        $this->pass = $pass;
        $this->host_name = "localhost"; //is used in HELO command
        $this->log_file = "";
        $this->sock = FALSE;
} 

    /* Main Function */
    function sendmail($to, $from, $subject = "", $body = "", $mailtype, $cc = "", $bcc = "", $additional_headers = "")
    {
        $mail_from = $this->get_address($this->strip_comment($from));
        $body = preg_replace("/(^|(\r\n))(\.)/", "\1.\3", $body);
        $header = "MIME-Version:1.0\r\n";
        if($mailtype=="HTML")
        {
            $header .= "Content-Type:text/html\r\n";
        }
        $header .= "To: ".$to."\r\n";
        if ($cc != "")
        {
            $header .= "Cc: ".$cc."\r\n";
        }
        $header .= "From: $from<".$from.">\r\n";
        $header .= "Subject: ".$subject."\r\n";
        $header .= $additional_headers;
        $header .= "Date: ".date("r")."\r\n";
        $header .= "X-Mailer:By Redhat (PHP/".phpversion().")\r\n";
        list($msec, $sec) = explode(" ", microtime());
        $header .= "Message-ID: <".date("YmdHis", $sec).".".($msec*1000000).".".$mail_from.">\r\n";
        $TO = explode(",", $this->strip_comment($to)); 

        if ($cc != "")
        {
            $TO = array_merge($TO, explode(",", $this->strip_comment($cc)));
            }
        if ($bcc != "")
        {
            $TO = array_merge($TO, explode(",", $this->strip_comment($bcc)));
        }
        $sent = TRUE;
        foreach ($TO as $rcpt_to)
        {
            $rcpt_to = $this->get_address($rcpt_to);
            if (!$this->smtp_sockopen($rcpt_to))
            {
                $this->log_write("Error: Cannot send email to ".$rcpt_to."\n");
                $sent = FALSE;
                continue;
            }
            if ($this->smtp_send($this->host_name, $mail_from, $rcpt_to, $header, $body))
            {
                $this->log_write("E-mail has been sent to <".$rcpt_to.">\n");
            }
            else
            {
                $this->log_write("Error: Cannot send email to <".$rcpt_to.">\n");
                $sent = FALSE;
            }
            fclose($this->sock);
            $this->log_write("Disconnected from remote host\n");
        }
        return $sent;
    } 

    /* Private Functions */
    function smtp_send($helo, $from, $to, $header, $body = "")
    {
        if (!$this->smtp_putcmd("HELO", $helo))
        {
            return $this->smtp_error("sending HELO command");
        } 

        #auth
        if($this->auth)
        {
            if (!$this->smtp_putcmd("AUTH LOGIN", base64_encode($this->user)))
            {
                return $this->smtp_error("sending HELO command");
            }
            if (!$this->smtp_putcmd("", base64_encode($this->pass)))
            {
                return $this->smtp_error("sending HELO command");
            }
        }
        if (!$this->smtp_putcmd("MAIL", "FROM:<".$from.">"))
        {
            return $this->smtp_error("sending MAIL FROM command");
        }
        if (!$this->smtp_putcmd("RCPT", "TO:<".$to.">"))
        {
            return $this->smtp_error("sending RCPT TO command");
        }
        if (!$this->smtp_putcmd("DATA"))
        {
            return $this->smtp_error("sending DATA command");
        }
        if (!$this->smtp_message($header, $body))
        {
            return $this->smtp_error("sending message");
        }
        if (!$this->smtp_eom())
        {
            return $this->smtp_error("sending <CR><LF>.<CR><LF> [EOM]");
        }
        if (!$this->smtp_putcmd("QUIT"))
        {
            return $this->smtp_error("sending QUIT command");
        }
        return TRUE;
    } 

    function smtp_sockopen($address)
    {
        if ($this->relay_host == "")
        {
            return $this->smtp_sockopen_mx($address);
        }
        else
        {
            return $this->smtp_sockopen_relay();
        }
    } 

    function smtp_sockopen_relay()
    {
        $this->log_write("Trying to ".$this->relay_host.":".$this->smtp_port."\n");
        $this->sock = @fsockopen($this->relay_host, $this->smtp_port, $errno, $errstr, $this->time_out);
        if (!($this->sock && $this->smtp_ok()))
        {
            $this->log_write("Error: Cannot connenct to relay host ".$this->relay_host."\n");
            $this->log_write("Error: ".$errstr." (".$errno.")\n");
            return FALSE;
        }
        $this->log_write("Connected to relay host ".$this->relay_host."\n");
        return TRUE;;
    } 

    function smtp_sockopen_mx($address)
    {
        $domain = preg_replace("^.+@([^@]+)$", "\1", $address);
        if (!@getmxrr($domain, $MXHOSTS))
        {
            $this->log_write("Error: Cannot resolve MX \"".$domain."\"\n");
            return FALSE;
        }
        foreach ($MXHOSTS as $host)
        {
            $this->log_write("Trying to ".$host.":".$this->smtp_port."\n");
            $this->sock = @fsockopen($host, $this->smtp_port, $errno, $errstr, $this->time_out);
            if (!($this->sock && $this->smtp_ok()))
            {
                $this->log_write("Warning: Cannot connect to mx host ".$host."\n");
                $this->log_write("Error: ".$errstr." (".$errno.")\n");
                continue;
            }
            $this->log_write("Connected to mx host ".$host."\n");
            return TRUE;
        }
        $this->log_write("Error: Cannot connect to any mx hosts (".implode(", ", $MXHOSTS).")\n");
        return FALSE;
    } 

    function smtp_message($header, $body)
    {
        fputs($this->sock, $header."\r\n".$body);
        $this->smtp_debug("> ".str_replace("\r\n", "\n"."> ", $header."\n> ".$body."\n> "));
        return TRUE;
    } 

    function smtp_eom()
    {
        fputs($this->sock, "\r\n.\r\n");
        $this->smtp_debug(". [EOM]\n");
        return $this->smtp_ok();
    } 

    function smtp_ok()
    {
        $response = str_replace("\r\n", "", fgets($this->sock, 512));
        $this->smtp_debug($response."\n");
        if (!preg_match("/^[23]/", $response))
        {
            fputs($this->sock, "QUIT\r\n");
            fgets($this->sock, 512);
            $this->log_write("Error: Remote host returned \"".$response."\"\n");
            return FALSE;
        }
        return TRUE;
    } 

    function smtp_putcmd($cmd, $arg = "")
    {
        if ($arg != "")
        {
            if($cmd=="")
            {
                $cmd = $arg;
            }
            else
            {
                $cmd = $cmd." ".$arg;
            }
        }
        fputs($this->sock, $cmd."\r\n");
        $this->smtp_debug("> ".$cmd."\n");
        return $this->smtp_ok();
    } 

    function smtp_error($string)
    {
        $this->log_write("Error: Error occurred while ".$string.".\n");
        return FALSE;
    } 

    function log_write($message)
    {
        $this->smtp_debug($message);
        if ($this->log_file == "")
        {
            return TRUE;
        }
        $message = date("M d H:i:s ").get_current_user()."[".getmypid()."]: ".$message;
        if (!@file_exists($this->log_file) || !($fp = @fopen($this->log_file, "a")))
        {
            $this->smtp_debug("Warning: Cannot open log file \"".$this->log_file."\"\n");
            return FALSE;;
        }
        flock($fp, LOCK_EX);
        fputs($fp, $message);
        fclose($fp);
        return TRUE;
    } 

    function strip_comment($address)
    {
        $comment = "/\([^()]*\)/";
        while (preg_match($comment, $address))
        {
            $address = preg_replace($comment, "", $address);
        }
        return $address;
    } 

    function get_address($address)
    {
        $address = preg_replace("/([ \t\r\n])+/", "", $address);
        $address = preg_replace("/^.*<(.+)>.*$/", "\1", $address);
        return $address;
    } 

    function smtp_debug($message)
    {
        if ($this->debug)
        {
            echo $message;
        }
    } 

}
?>

　　调用

<?php
header("Content-Type: text/html; charset=utf-8");

//引入发送邮件类
require("smtp.php");
//使用163邮箱服务器
$smtpserver = "smtp.163.com";
//163邮箱服务器端口
$smtpserverport = 25;
//你的163服务器邮箱账号
$smtpusermail = "xxx@163.com";
//收件人邮箱
$smtpemailto = "xxx@qq.com";

//你的邮箱账号(去掉@163.com)
$smtpuser = "xxx";//你的163邮箱去掉后面的163.com
//你的邮箱密码
$smtppass = "xxx"; //你的163邮箱SMTP的授权码，千万不要填密码！！！

//邮件主题
$mailsubject = "测试邮件发送";
//邮件内容
$mailbody = "PHP+MySQL";
//邮件格式（HTML/TXT）,TXT为文本邮件
$mailtype = "TXT";
//这里面的一个true是表示使用身份验证,否则不使用身份验证.
$smtp = new smtp($smtpserver,$smtpserverport,true,$smtpuser,$smtppass);
//是否显示发送的调试信息
$smtp->debug = TRUE;
//发送邮件
$smtp->sendmail($smtpemailto, $smtpusermail, $mailsubject, $mailbody, $mailtype); 

?>

　　代码链接

http://files.cnblogs.com/files/Dong-Ge/sendMail.rar