Although delivery restrictions box is set to maximum size, users cannot get mail with attachments over 2MB. It does not matter who sends it to us, no one in our domain can get email with attachments over 2MB. We have a new firewall, could this be causing the problem. It is a WatchGuard Firebox 550. The senders of the emails do and don't get bounce back messages of undelivered mail. Sometimes they do and sometimes they don't. Our email client is Outlook 2003. What gives?