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");

}