php中通过curl smtp发送邮件

这个在网上可以找到多相关的例子,可以自己实验一下使用telnet去连接mail服务器 

$ telnet 邮箱SMTP服务地址 25 
Trying 邮箱服务IP地址... 
Connected to 邮箱SMTP服务地址. 
Escape character is '^]'. 
exchange邮箱服务器地址 Microsoft ESMTP MAIL Service ready at Sat, 2 Jun 2012 15:02:12 +0800 
EHLO 127.0.0.1 
-exchange邮箱服务器地址 Hello [邮箱服务IP地址] 
-SIZE 
-PIPELINING 
-DSN 
-ENHANCEDSTATUSCODES 
-X-ANONYMOUSTLS 
-AUTH NTLM LOGIN 
-X-EXPS GSSAPI NTLM 
-8BITMIME 
-BINARYMIME 
-CHUNKING 
-XEXCH50 
XRDST 
AUTH LOGIN 
VXNlcm5hbWU6 
用户名(base64_encode) 
UGFzc3dvcmQ6 
密码(base64_encode) 
2.7.0 Authentication successful 
MAIL FROM:发件箱地址 
2.1.0 Sender OK 
RCPT TO:收件箱地址 
2.1.5 Recipient OK 
DATA 
Start mail input; end with <CRLF>.<CRLF> 
要发送的内容(这里的相关的规范有很多) 
. 
2.6.0 <0b476f30-3b96-4e3d-84d2-395a96d34000@exchange邮箱服务器地址> Queued mail for delivery 
QUIT 
2.0.0 Service closing transmission channel 
Connection closed by foreign host.

<?php 
//author http://www.lai18.com
header("content-type:text/html;charset=utf-8"); 
$smtp = array( 
"url" => "邮箱SMTP服务器地址", 
"port" => "邮箱SMTP服务器端口", // 一般为25 
"username" => "用户名", 
"password" => "密码", 
"from" => "发件地址", 
"to" => "收件地址", 
"subject" => "测试一下标题", 
"body" => "测试一下内容" 
); 
$CRLF = "\r\n"; 
$test = ""; 
$curl = curl_init(); 
curl_setopt($curl, CURLOPT_URL, $smtp['url']); 
curl_setopt($curl, CURLOPT_PORT, $smtp['port']); 
curl_setopt($curl, CURLOPT_TIMEOUT,10); 
function inlineCode($str){ 
$str = trim($str); 
return $str?'=?UTF-8?B?'.base64_encode($str).'?= ':''; 
} 
function buildHeader($headers){ 
$ret = ''; 
foreach($headers as $k=>$v){ 
$ret.=$k.': '.$v."\n"; 
} 
return $ret; 
} 
// 
$header = array( 
'Return-path'=>'<'.$smtp['from'].'>', 
'Date'=>date('r'), 
'From'=> '<'.$smtp['from'].'>', 
'MIME-Version'=>'1.0', 
'Subject'=>inlineCode($smtp['subject']), 
'To'=>$smtp['to'], 
'Content-Type'=>'text/html; charset=UTF-8; format=flowed', 
'Content-Transfer-Encoding'=>'base64' 
); 
$data = buildHeader($header).$CRLF.chunk_split(base64_encode($smtp['body'])); 
$content = "EHLO ".$smtp["url"].$CRLF; // 先得hello一下 
$content .= "AUTH LOGIN".$CRLF.base64_encode($smtp["username"]).$CRLF.base64_encode($smtp["password"]).$CRLF; // 验证登陆 
$content .= "MAIL FROM:".$smtp["from"].$CRLF; // 发件地址 
$content .= "RCPT TO:".$smtp["to"].$CRLF; // 收件地址 
$content .= "DATA".$CRLF.$data.$CRLF.".".$CRLF; // 发送内容 
$content .= "QUIT".$CRLF; // 退出 
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true); // curl接收返回数据 
curl_setopt($curl, CURLOPT_CUSTOMREQUEST, $content); 
$test = curl_exec($curl); 
var_dump($test); 
echo "<br/>\r\n"; 
var_dump($content); 
// 结束 
curl_close($curl);