发送email的一个问题

Question

非法的email地址检查是很容易，可是怎么检查对方的Email是否存在？不知道该怎么弄，imap/POP3  都不懂   请指点一二，谢谢帮忙

Answer 1

这个比较麻烦，要先检查邮件后面的域名的DNS对应的IP是否有效
然后再检查前面的邮箱名是否真的存在
蛮以前做过个，记得是用下面的这个类做的貌似
http://www.phpclasses.org/browse/package/13.html

Answer 2

网上找了一个..希望对lz有用..---------------------------------------------------------------------------------SMTP判断邮箱是否存在,检查email地址是否真实存在判断一个Email是否存在的类 
作者:mlemos
来源:www.fastboard.org<?  
/*  
*  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="";  
 
           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,$email)!=0);  
                       return(eregi("^([a-z0-9_]  |\\-  |\\.)+@(([a-z0-9_]  |\\-)+\\.)+[a-z]{2,4}$",$email)!=0);  
           }  
 
           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;$host<count($hosts);$host++)  
                                               $mxhosts[$weights[$host]]=$hosts[$host];  
                                   KSort($mxhosts);  
                                   for(Reset($mxhosts),$host=0;$host<count($mxhosts);Next($mxhosts),$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;$host<count($hosts);$host++)  
                       {  
                                   if(($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);  
           }  
};  
 
?>  
=============================================================================  
 
-----------------------------------------------------------------------------  
 
应用范例：  
=============================================================================  
echo  "<center><br/>检查电子邮件地址的正确性:<br/>";  
 
$newmail  =  "[email protected]";  
 
require("email_validation.php3");  
 
$validator=new  email_validation_class;  
$validator->timeout=10;  
 
if(IsSet($newemail)  &&  strcmp($newemail,""))  
{  
           if(($result=$validator->ValidateEmailBox($newemail))<0)  
           {  
                       echo  "不能确定您的信箱是否正确.  您的信箱离这里太远了吧?<br/>";  
                       return;  
           }  
           else  
           {    
                       if(!$result)  
                       {    
                                   echo  "您输入的信箱地址是不正确的!  :)<br/>";  
                                   return;  
                       }  
                       else    
                                   echo  "邮箱合法!<br/>";  
           }  
}  

Answer 3

有一点点郁闷，上面俩个我没有调试出来
http://www.phpclasses.org/browse/package/13.html   这个可以运行了，但是测试结果不对
ai_ni  的代码运行不起来  
呵呵 头发又掉了好几根了