PHP基于SMTP协议实现邮件发送实例代码

 telnet smtp.163.com 25 

 Trying 220.181.12.16... Connected to smtp.163.com. Escape character is '^]'. 220 163.com Anti-spam GT for Coremail System (163com[20141201])

 HELO smtp.163.com

 class Mailer { private $host; private $port = 25; private $user; private $pass; private $debug = false; private $sock; public function __construct($host,$port,$user,$pass,$debug = false) { $this->host = $host; $this->port = $port; $this->user = base64_encode($user); //用户名密码一定要使用base64编码才行 $this->pass = base64_encode($pass); $this->debug = $debug; //socket连接 $this->sock = fsockopen($this->host,$this->port); if(!$this->sock){ exit('出错啦'); } //读取smtp服务返回给我们的数据 $response = fgets($this->sock); $this->debug($response); //如果响应中有220返回码，说明我们连接成功了 if(strstr($response,'220') === false){ exit('出错啦'); } } //发送SMTP指令，不同指令的返回码可能不同 public function execCommand($cmd,$return_code){ fwrite($this->sock,$cmd); $response = fgets($this->sock); //输出调试信息 $this->debug('cmd:'.$cmd .';response:'.$response); if(strstr($response,$return_code) === false){ return false; } return true; } public function sendMail($from,$to,$subject,$body){ //detail是邮件的内容，一定要严格按照下面的格式，这是协议规定的 $detail = 'From:'.$from."\r\n"; $detail .= 'To:'.$to."\r\n"; $detail .= 'Subject:'.$subject."\r\n"; $detail .= 'Content-Type: Text/html;'."\r\n"; $detail .= 'charset=gb2312'."\r\n\r\n"; $detail .= $body; $this->execCommand("HELO ".$this->host."\r\n",250); $this->execCommand("AUTH LOGIN\r\n",334); $this->execCommand($this->user."\r\n",334); $this->execCommand($this->pass."\r\n",235); $this->execCommand("MAIL FROM:<".$from.">\r\n",250); $this->execCommand("RCPT TO:<".$to.">\r\n",250); $this->execCommand("DATA\r\n",354); $this->execCommand($detail."\r\n.\r\n",250); $this->execCommand("QUIT\r\n",221); } public function debug($message){ if($this->debug){ echo '
Debug:'.$message . PHP_EOL .'
'; } } public function __destruct() { fclose($this->sock); } } 

 $port = 25; $user = 'username'; //请替换成你自己的smtp用户名 $pass = 'pass'; //请替换成你自己的smtp密码 $host = 'smtp.163.com'; $from = 'xxxxx@163.com'; $to = 'xxxx@qq.com'; $body = 'hello world'; $subjet = '我是标题'; $mailer = new Mailer($host,$port,$user,$pass,true); $mailer->sendMail($from,$to,$subjet,$body);

 Debug:220 163.com Anti-spam GT for Coremail System (163com[20141201]) Debug:cmd:HELO smtp.163.com ;response:250 OK Debug:cmd:AUTH LOGIN ;response:334 dXNlcm5hbWU6 Debug:cmd:aXR6aG91anVuYmxvZ0AxNjMuY29t ;response:334 UGFzc3dvcmQ6 Debug:cmd:QzBjSGRRNe32xiNGFYUE5oag== ;response:235 Authentication successful Debug:cmd:MAIL FROM: ;response:250 Mail OK Debug:cmd:RCPT TO:<380472723@qq.com> ;response:250 Mail OK Debug:cmd:DATA ;response:354 End data with . Debug:cmd:From:itzhoujunblog@163.com To:380472723@qq.com Subject:我是标题 Content-Type: Text/html; charset=gb2312 hello world . ;response:250 Mail OK queued as smtp11,D8CowACXHE5APdNYCo0hAQ--.19144S2 1490238785 Debug:cmd:QUIT ;response:221 Bye