We used to use mdaemon as our email program inhouse, then we migrated to Outlook 2003. However some users did not get fully migrated, they stayed on mdaemon using the Outlook connector. In general it works well, however things are odd with a few users when they send new emails to a specific account, let's call it email@example.com. When john sends and email and they respond, there is no problem, but when one of these users that are on mdaemon send a new email to firstname.lastname@example.org it does not reach its destination. I would like to see what's going on. What can I look at to try to fix this problem? I've thought of deleting the account and creating a nuew one, but this is problematic becuase of all the emails send and received over the years. Can someone shed some light as to how I can track down via logs and see what's the problem. IS there some black / white list? thanks.