I have a home network with an XP and Ubuntu (9.10) box. I have created a small test php script for checking that I can send emails from my machine. I am using the same php.ini file with the same [mail settings], yet the file works on my XP box, and fails on the Ubuntu box. I have included the script here, hopefully, someone can spot whats going wrong: <?php // send e-mail to ... $to="[email protected]"; // Your subject $subject="Test Email"; // From //$header="from: test script"; $header='From: host-email-username@hostdomain_here' . "\r\n" . // Your message $message="Hello \r\n"; $message.="This is test\r\n"; $message.="Test again "; // send email $sentmail = mail($to,$subject,$message,$header); // if your email succesfully sent if($sentmail){ echo "Email Has Been Sent ."; } else { echo "Cannot Send Email "; } ?> The emails have been spoofed for obvious reasons, but otherwise, the script is exactly as the one I tested [Edit] I have since installed mailutils package on my Ubuntu box, now the script runs and returns 'Email has been sent'. However, the mail never arrives in my mail inbox (I've waited 1 day so far). Is there something else I need to be looking at?