I'm going crazy with this…I've set up contact forms on various add-on domains and they've been working fine.  The sender was set as csaborio@cow.com.  I noticed that I was not receiving e-mail through the contact form and I did a test and the mail was indeed never received.

After some testing, I created the following PHP file:

<?php
mail("csaborio@bar.com", "Test Subject", "Test Body", "From:csaborio@bar.com");
echo "Email sent";
?>

I ran the script and I got nothing.  This 'bar.com' account was the one through which I was always sending mail.  I changed the bar.com address (both sender and recipient) to another domain I have (let's call it foo.com) and I *got* the e-mail.

This lead me to believe there was some spam filtering going on, but there is nothing on the spam folder, the e-mail is simply lost.

I then changed the script so that the sender was foo.bar and the recipient was bar.com and nothing.  Any help is greatly appreciated, I am indeed going crazy.

Thanks!