This problem just appeared up this week. SBS 2003 Premium. Exchange 2003.
About 30 clients running Outlook 2003, and a couple using Outlook 2007.

One user (the owner) using Outlook 2003 has had half a dozen or so emails
from within our company sent to his Junk Email folder by Outlook. I set our
domain as a safe sender and it shows up in the safe senders list as
". Following the examples they use, I tried adding just
"ourdomain.net" (no @) but it doesn't appear to be showing up on the list,
even after restarting Outlook.

Any idea why our domain would suddenly start getting sporadically shifted to
Junk Email, and why setting it as a safe sender is being ignored?

TIA