php通过smtp发送邮件需要通过一个类smtp

发邮件的代码如下：

require_once 'smtp.php';

########################################## 
$smtpserver = "smtp.sina.com";//SMTP服务器 
$smtpserverport = 25;//SMTP服务器端口 
$smtpusermail = "[email protected]";//SMTP服务器的用户邮箱 
$smtpemailto = "[email protected]";//发送给谁 
$smtpuser = "name";//SMTP服务器的用户帐号 
$smtppass = "123456";//SMTP服务器的用户密码 
$mailsubject = "中文";//邮件主题 
$mailbody = "<h1>中文</h1>测试下能淤泥新年感";//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 = FALSE;//是否显示发送的调试信息 
$smtp->sendmail($smtpemailto, $smtpusermail, $mailsubject, $mailbody, $mailtype)

smtp类的源码如下：

<?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;
}
}

}