Email Validation

[alpesh]

Quote:

<?php

if (!isset($email)){
die("Host name value wasn't properly submitted.Retry.");
}

if(empty($email)) {
die("Hostname field was left blank ! Retry.");
}

if ( (strlen($email) < 3) || (strlen($email) > 200)) {
die("Invalid E-mail address, E-mail address too long or too short.");
} elseif(!ereg("@",$email)) {
die("Invalid E-mail address, no @ symbol found");
} else {
echo "".$email." is correct in format.<br>";
}

list($username,$hostname) = split("@",$email);

if ( (empty($username)) or (empty($hostname)) ) {
die("username or host name section is not valid.");
}

if(checkdnsrr($hostname)) {
echo "". $email ." hostname has a valid MX record !<br>";
} else {
die("". $email ." hostname does not exist");
}
?>

[PaulButler]

Cool... but it looks like any character is accepted in the username part of the email addresss... From what I can tell, !@#$%^&*()_-=+@gmail.com would be considered a valid address.

I usually limit email checking to a simple regex like this:

php:

function validEmail($email){      return preg_match('/^[a-z0-9_.+-]+@(?:[a-z0-9-]+\\.)+[a-z]{2,6}$/', $email); }

I didn't know it would be so easy to verify that an MX record existed at the email's hostname... Maybe I will start doing that from now on.