PHP一个发送邮件的类

现在很多主机空间都是IIS上执行PHP程序，大多不能直接用mail()发送邮件，有了这个类只要你有注册过邮箱，就可以随意的发送邮件，速度也不慢哦。

//******************************
// smtp.php文件
//
//******************************
<?php
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 = ereg_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)

    {

        $domain = ereg_replace("^.+@([^@]+)$", "/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 (!ereg("^[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 (ereg($comment, $address)) {

            $address = ereg_replace($comment, "", $address);

        }

        return $address;

    }

    function get_address($address)

    {

        $address = ereg_replace("([ /t/r/n])+", "", $address);

        $address = ereg_replace("^.*<(.+)>.*$", "/1", $address);

        return $address;

    }

    function smtp_debug($message)

    {

        if ($this->debug) {

        echo $message;

        }

    }

}

?>

//*****************************************************************
// *.php 使用文件，看清楚了，怎么使用在这里
//
//*****************************************************************

<?

require (FILE_DIR."smtp.php");

$smtpserver = "smtp.xxx.com";//SMTP服务器

$smtpserverport =25;//SMTP服务器端口

$smtpusermail = "xxxxx@xxx.com";//SMTP服务器的用户邮箱

$smtpemailto = "aaaaa@xxx.com";//发送给谁

$smtpuser = "xxxxx";//SMTP服务器的用户帐号

$smtppass = "xxxxx";//SMTP服务器的用户密码

$mailsubject = "Test Subject";//邮件主题

$mailbody = "<h1>This is a test mail</h1>";//邮件内容

$mailtype = "HTML";//邮件格式（HTML/TXT）,TXT为文本邮件

$smtp = new smtp($smtpserver,$smtpserverport,true,$smtpuser,$smtppass);//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->debug = TRUE;//是否显示发送的调试信息

$smtp->sendmail($smtpemailto, $smtpusermail, $mailsubject, $mailbody, $mailtype);

?>

原文出处：http://www.programfan.com/article/showarticle.asp?id=2810