Hi, you can use this class: 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);