Motorola Atrix 2 :: Can't Send Mail Via SMTP On Exchange Server

My very small company uses Exchange Server 2003 to host our own email. On my laptop, I use Outlook. When I'm out of the office I connect my laptop to the internet and access my exchange mail via an IMAP account. With that connection, I can send mail using the SMTP server. I got my new Atrix 2 and set up that account using the advanced settings that were the closest to the settings I use for the IMAP account in my Outlook setup. I was immediately able to see my inbox and receive email. After one tweak (that I can't remember any more), I was able to sent mail. Then a few hours later, I couldn't. I've tried every possible combination of the Advanced Settings in the Account Setup screens on the phone. Nothing works. I tried a Master Reset and all that accomplished was flushing away the contact list that the salesperson had copied to my new Atrix from my old phone when I bought it. I thought that was backed up to Google and would be restored when I logged back in but apparently not. Any advice on how to get that back? But the main problem is sending mail.