I have recently migrated from FC 5 running 4.5.11 to CentOS 5.1 running 4.5.11 and am using the following command to send the nightly backup logs to myself. When I send it to my gmail or any other account outside of my domain it works perfectly but when trying to send to firstname.lastname@example.org I never receive the mail, I also don't see any errors in the logs either. This used to work fine in FC 5 so not sure if it is related to the move to CentOS or moving zimbra to the new box.
mutt -s "Nightly Zimbra Backup Log" -a /var/log/zimbra_backup.log email@example.com firstname.lastname@example.org < /dev/null
Any help would be appreciated.