php驗證信箱是否真實存在

php驗證郵箱是否真實存在
大家好，我是php新手，現在有個問題想請教大家，就是註冊時驗證該email地址是否真的存在，謝謝

環境win32+php5.45

test.php

echo "
檢查電子郵件地址的正確性:
"; 
require("email_validation.php"); 
$newmail = "[email protected]"; 
$validator=new email_validation_class; 
$validator->timeout=10; 

//if(IsSet($newemail) && strcmp($newemail,"")){
if( ($result=$validator->ValidateEmailBox($newmail) )<0){ 
echo "不能確定您的信箱是否正確. 您的信箱離這裡太遠了吧?
"; 
return; 
}else{ 
echo "22222222";
if(!$result){ 
echo "您輸入的信箱地址是不正確的! :)
"; 
return; 
}else{
echo "郵箱合法!
"; 
} 
}

?>

email_validation.php

class email_validation_class 
{ 
//var $email_regular_expression="^([a-z0-9_] |//- |//.)+@(([a-z0-9_] |//-)+//.)+[a-z]{2,4}$"; 
var $timeout=0; 
var $localhost=""; 
var $localuser=""; 
var $hosts=0;

Function GetLine($connection) 
{ 
for($line="";;) 
{ 
if(feof($connection)) 
return(0); 
$line.=fgets($connection,100); 
$length=strlen($line); 
if($length>=2 && substr($line,$length-2,2)=="/r/n") 
return(substr($line,0,$length-2)); 
} 
} 

Function PutLine($connection,$line) 
{ 
return(fputs($connection,"$line/r/n")); 
} 

Function ValidateEmailAddress($email) { 
//return(eregi($this->email_regular_expression,$email)!=0); 
//origin:
//return(eregi("^([a-z0-9_] |//- |//.)+@(([a-z0-9_] |//-)+//.)+[a-z]{2,4}$",$email)!=0); 

//return preg_match("/^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$/i", $_REQUEST[$email]);
return preg_match("/^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$/", $_REQUEST[$email]);

} 

Function ValidateEmailHost($email,$hosts=0) 
{ 
if(!$this->ValidateEmailAddress($email)) 
return(0); 
$user=strtok($email,"@"); 
$domain=strtok(""); 
if(GetMXRR($domain,$hosts,$weights)) 
{ 
$mxhosts=array(); 
for($host=0;$host$mxhosts[$weights[$host]]=$hosts[$host]; 
KSort($mxhosts); 
for(Reset($mxhosts),$host=0;$host$hosts[$host]=$mxhosts[Key($mxhosts)]; 
} 
else 
{ 
$hosts=array(); 
if(strcmp(@gethostbyname($domain),$domain)!=0) 
$hosts[]=$domain; 
} 
return(count($hosts)!=0); 
} 

Function VerifyResultLines($connection,$code) 
{ 
while(($line=$this->GetLine($connection))) 
{ 
if(!strcmp(strtok($line," "),$code)) 
return(1); 
if(strcmp(strtok($line,"-"),$code)) 
return(0); 
} 
return(-1); 
} 

Function ValidateEmailBox($email) 
{ 
if(!$this->ValidateEmailHost($email,$hosts)) 
return(0); 
if(!strcmp($localhost=$this->localhost,"") && !strcmp($localhost=getenv("SERVER_NAME"),"") && !strcmp($localhost=getenv("HOST"),"")) 
$localhost="localhost"; 
if(!strcmp($localuser=$this->localuser,"") && !strcmp($localuser=getenv("USERNAME"),"") && !strcmp($localuser=getenv("USER"),"")) 
$localuser="root"; 
for($host=0;$host{ 
if(($connection=($this->timeout ? fsockopen($hosts[$host],25,$errno,$error,$this->timeout) : fsockopen($hosts[$host],25)))) 
{ 
if($this->VerifyResultLines($connection,"220")>0 && $this->PutLine($connection,"HELO $localhost") && $this->VerifyResultLines($connection,"250")>0 && $this->PutLine($connection,"MAIL FROM: <$localuser@$localhost>") && $this->VerifyResultLines($connection,"250")>0 && $this->PutLine($connection,"RCPT TO: <$email>") && ($result=$this->VerifyResultLines($connection,"250"))>=0) 
{ 
fclose($connection); 
return($result); 
} 
fclose($connection); 
} 
} 
return(-1); 
} 
}; 

?> 

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------解決方案--------------------
不懂，我的想法就是，最多驗證一下格式是否正確，然後像大家一樣，往他郵箱發啟用碼，用以完成註冊的最後一步。你想要直接驗證，除非郵箱服務商提供介面讓你驗證。不然。
------解決方案--------------------
email 的真實性是無法判斷的，雖然任何一個郵件伺服器都有郵箱列表功能。但大多都不會對外開放
需要用郵件啟用註冊，看上去不錯。但是建立在網站管理員的職業道德上的。你收到的那些廣告郵件就是這樣來的

