email address exist or not????

hi all
iam newbie in php
i want to create a form in php
in which it has some filelds
like username:
email address1:
email address2:
email address3:

submit buttom

i want to create a form something look like this in which the person who is
member of my site will put his username in the filed
and he has to introduce 3 valid email addresses in their corresponding fields
to get some advantages from my site
but i want to have some procedure in which it checks the email addresses
to see whether they are real email addresses
and by clicking submit button one copy of the 3 email addresses will be emailed to me as well

how can i do that to check the email addresses to see they are real
is there any way to do that
suppose the user enters a@yahoo.com or something which is not exists
i mean i want to check both the domain name and the email address
maybe he enters a@domiannotexist.com or a@yahoo.com
in which in both the first the domain is not exist
and second the email address is not valid or maybe deactivated
how can i check that
and by the way i want to be sure that the user out the email address
also correctly
suppose he does not miss @ and if he did the error message shows that
this@ is missing

is it possible suppose to use a smtp server inside the code
to email the address which the user puts inside the filed
and it automatically emails the 3 email addresses
and if the mail daemon delivery emails back it will undrestand that the email
is not correct or does not exist and near the filed of that email address shows email is not verified
but is should read the header of the email
cause maybe the server has some auto response which is not a mail delivery deamon

is there any way i can do this?

 

thanks for the reply
but did u get any code?

 

Hello ALL,

I hope you're fine,

so for amil validation using a simple php script use this:

 
function checkEmail($email) 
{
   if(eregi("^[a-zA-Z0-9_]+@[a-zA-Z0-9\-]+\.[a-zA-Z0-9\-\.]+$]", $email)) 
   {
      return FALSE;
   }
 
   list($Username, $Domain) = split("@",$email);
 
   if(getmxrr($Domain, $MXHost)) 
   {
      return TRUE;
   }
   else 
   {
      if(fsockopen($Domain, 25, $errno, $errstr, 30)) 
      {
         return TRUE; 
      }
      else 
      {
         return FALSE; 
      }
   }
}
 
 

PHP:

How to use it ?

in your php script use :

 
 
if(checkEmail(a@yahoo.com) == FALSE) 
{
   echo "E-mail entered is not valid.";
} 
else 
{
   echo "E-mail entered is valid.";
}
 

PHP:

But thsi way check only email domain (I mean the name aftre '@' character like 'yahoo.com') , or a regular expresions , but not checking if email is real and it exist !!

How to do that ?
You can use some of features of this website : http://www.network-tools.com

and for the validation email send "GET" request like this

http://network-tools.com/default.asp?prog=validate&host=[Email Address]
 
example :
 
http://network-tools.com/default.asp?prog=validate&host=info@csphennaya.com

PHP:

and server's response will be like this :

1- If Email is valide :

 

Validation results 
canonical address: <info@csphennaya.com> 
MX records preferenceexchangeIP address (if included)0csphennaya.com[74.220.215.58]SMTP session [Contacting csphennaya.com [74.220.215.58]...]
[Connected]
220-host258.hostmonster.com ESMTP Exim 4.69 #1 Wed, 22 Oct 2008 18:00:24 -0600 
220-We do not authorize the use of this system to transport unsolicited, 
220 and/or bulk e-mail.
EHLO Network-Tools.com
250-host258.hostmonster.com Hello Network-Tools.com [67.222.132.194]
250-SIZE 52428800
250-PIPELINING
250-AUTH PLAIN LOGIN
250-STARTTLS
250 HELP
VRFY info
252 Administrative prohibition
RSET
250 Reset OK
EXPN info
550 Administrative prohibition
RSET
250 Reset OK
MAIL FROM:<admin@Network-Tools.com>
250 OK
RCPT TO:<info@csphennaya.com>
250 Accepted
RSET
250 Reset OK
QUIT
221 host258.hostmonster.com closing connection
[Connection closed]

PHP:

you can write a small script that check if the response text contain "250 Accepted" that means : email is valide

2- If Email is not valide :

Validation results error: Recipient rejected

canonical address: <nothing@csphennaya.com> 
MX records preferenceexchangeIP address (if included)0csphennaya.com[74.220.215.58]SMTP session [Contacting csphennaya.com [74.220.215.58]...]
[Connected]
220-host258.hostmonster.com ESMTP Exim 4.69 #1 Wed, 22 Oct 2008 18:01:09 -0600 
220-We do not authorize the use of this system to transport unsolicited, 
220 and/or bulk e-mail.
EHLO Network-Tools.com
250-host258.hostmonster.com Hello Network-Tools.com [67.222.132.194]
250-SIZE 52428800
250-PIPELINING
250-AUTH PLAIN LOGIN
250-STARTTLS
250 HELP
VRFY nothing
252 Administrative prohibition
RSET
250 Reset OK
EXPN nothing
550 Administrative prohibition
RSET
250 Reset OK
MAIL FROM:<admin@Network-Tools.com>
250 OK
RCPT TO:<nothing@csphennaya.com>
550 No Such User Here
[Address has been rejected]
RSET
250 Reset OK
QUIT
221 host258.hostmonster.com closing connection
[Connection closed]

 

PHP:

you can write a small script that check if the response text contain "550 No Such User Here" that means : email is not valide

end;

but I think that's the most used an effecient way to check email is : BY SENDING A VALIDATION LINK TO THIS EMAIL OR VALIDATION NUMBER ....

because the way of pinging email server , take time and you will have a very slowly page , and some error daily ...

Best Regards

CHEMOURI.

Happy to help other