用socket发邮件有个有关问题

	class aMail{

		public static $smtp_prot = 25;

		public static $debug = true;

		public static $crlf  = "\r\n";

		var $smtp_host;

		var $login_name;

		var $password;

		var $form;

		var $to;

		var $err;

		var $message;

		var $socket;

		function __construct($options=""){

			if($options == "" || !is_array($options)){

				return false;

			}

			foreach($options as $key=>$val){

				$this->$key = $val;

			}

		}



		function sendMail(){						 

			$this->socket = fsockopen($this->smtp_host,self::$smtp_prot);

			$socket = $this->socket;

			$crlf   = self::$crlf;

			stream_set_blocking($socket,true);

			$this->message = fgets($socket,512);	

			echo $this->message;

			if(!$this->print_messsage("/^220/","connect fail")){

				return false;

			}



			fputs($socket,"EHLO 127.0.0.1 ".$crlf);

			$this->message = fgets($socket, 512);				

			if(!$this->print_messsage("/^2/","EHLO fail")){

				return false;

			}

			

			fputs($socket,"AUTH LOGIN".$crlf);

			$this->message = fgets($socket, 512);				

			$this->print_messsage("/^2/","AUTH LOGIN fail");

			

			fputs($socket,base64_encode($this->login_name).$crlf);

			$this->message = fgets($socket, 512);				

			$this->print_messsage("/^2/","login_name fail");

			

			fputs($socket,base64_encode($this->password).$crlf);

			$this->message = fgets($socket, 512);				

			$this->print_messsage("/^2/","password fail");			



			fputs($socket,"MAIL FROM: <".$this->from.">".$crlf);

			$this->message = fgets($socket, 512);

			$this->print_messsage("/^2/","from fail");



			fputs($socket,"RCPT TO: <".$this->to.">".$crlf);

			$this->message = fgets($socket, 512);

			$this->print_messsage("/^334|^2/","to fail");

			

			fputs($socket,"DATA".$crlf);

			$this->message = fgets($socket, 512);

			$this->print_messsage("/^334|^2/","DATA fail");			



			$html = implode("",array(

						"To: ".$this->to.$crlf,

						"From: ".$this->from.$crlf,

						"Subject: ".$this->subject.$crlf.$crlf,

						$this->content.$crlf.".".$crlf,

					));



			fputs($socket,$html);

			$this->message = fgets($socket, 512);

			$this->print_messsage("/^2/","html fail");

			

			fputs($socket, "QUIT".$crlf);

			$this->message=fgets($socket,512);

			$this->print_messsage("/^2/","QUIT fail");

		}

		function print_messsage($reg="",$err=""){

			$message = $this->message;

			if(preg_match($reg,$message)<=0){

				$this->err = $err."___".$message."--------------";

				echo $err."___".$message."--------------
";

				return false;

			}

			if(self::$debug){

				echo $this->message."
";

			}

			return true;

		}

	}

	$mail_options = array(

					"smtp_host"=>"smtp.sina.com.cn",

					"login_name"=>"ycwtt0527",