dpinion - 8:06 pm on Apr 4, 2011 (gmt 0)

No problem Coopster. I hate when I find posts where someone says they solved it but offer no resolution. In my case i needed to run the following command:

/usr/local/psa/bin

./domain --update domain.com -mail_service false

This shut down the internal mail server and let our actual delivery method be used. This was with a 1and1 cloud hosting package with plesk 10.2. Logged in via ssh using PUTTY to execute the command.. :)