No Mail to .Edus

Problem with Script?

[inuwolf]

I've finally worked out the big bugs from my mail script. Although it works for Gmail, Yahoo, and paid email providers, it doesn't send mail to addresses @ the .edu domain to which the confirmation emails are supposed to be sent (this is a registration script).

Why?

Both the edu site and my server use Squirrelmail. Is it a matter of spam filtering, or problems with my script--I'll include the headers below. This is the school I attend, and ITS has not helped me.

Headers:
$headers = "From: [e-mail]\n";
$headers .= "To: ".$email."\n";
$headers .= "Reply-To: [e-mail]\n";
$headers .= "X-Priority: 1\n";
$headers .= "MIME-Version: 1.0\n";
$headers .= "Mailer: SquirrelMail version 1.4.3a\n";
$headers .= "Content-Type: text/plain; charset=\"iso-8859-1\"\n";
$headers .= "Content-Transfer-Encoding: 8bit\n";
___________________________________

Thanks, I appreciate all the pointers I've been given since I registered here.

[inuwolf]

Nevermind. I removed the Squirrelmail header, because it's not essential anyway, and the mail finally made it through. I think the header caused relaying between the S' mail servers. Let that be a lesson to anyone else in my situation, as rare as it may be. :)