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("/(^|(
))(.)/", "1.3", $body); 
        $header = "MIME-Version:1.0
"; 
        if($mailtype=="HTML") 
        { 
            $header .= "Content-Type:text/html
"; 
        } 
        $header .= "To: ".$to."
"; 
        if ($cc != "")  
        { 
            $header .= "Cc: ".$cc."
"; 
        } 
        $header .= "From: $from<".$from.">
"; 
        $header .= "Subject: ".$subject."
"; 
        $header .= $additional_headers; 
        $header .= "Date: ".date("r")."
"; 
        $header .= "X-Mailer:By Redhat (PHP/".phpversion().")
"; 
        list($msec, $sec) = explode(" ", microtime()); 
        $header .= "Message-ID: <".date("YmdHis", $sec).".".($msec*1000000).".".$mail_from.">
"; 
        $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."
"); 
                $sent = FALSE; 
                continue; 
            } 
            if ($this->smtp_send($this->host_name, $mail_from, $rcpt_to, $header, $body))  
            { 
                $this->log_write("E-mail has been sent to <".$rcpt_to.">
"); 
            }  
            else  
            { 
                $this->log_write("Error: Cannot send email to <".$rcpt_to.">
"); 
                $sent = FALSE; 
            } 
            fclose($this->sock); 
            $this->log_write("Disconnected from remote host
"); 
        } 
        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."
"); 
        $this->sock = @fsockopen($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."
"); 
            $this->log_write("Error: ".$errstr." (".$errno.")
"); 
            return FALSE; 
        } 
        $this->log_write("Connected to relay host ".$this->relay_host."
"); 
        return TRUE;; 
    } 

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

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

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

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

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

    function smtp_error($string) 
    { 
        $this->log_write("Error: Error occurred while ".$string.".
"); 
        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.""
"); 
            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("/([ 	
])+/", "", $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