rocknbil - 4:58 pm on Jun 4, 2012 (gmt 0)

First, how are you creating this "auto responder?" A PHP example,

if (preg_match('/\.edu$/i',$the_cleansed_email_address)) {
// send the mail here
}
else { die("Invalid email address"); }

If you're doing this because it's getting spammed and you hope to stop it this way, it won't. Spammers can fake .edu email addresses too.