We cannot receive email from certain domains. These messages are not archived in the BadMail folder - they simply do not arrive. I have confirmed that they are sending to the proper email addresses. I have no problem receiving email from these domains in my personal yahoo! email. The sender receives no response indicating that there are any issues.
We are running SBS 2003 and within Exchange I have Sender, Sender ID, IMF, and Connection Filtering enabled.
Here are the settings for each:
Sender Filtering: Archive filtered messages; Filter messages with blank sender (I have cleared the block list.)
Sender ID Filtering: If Sender ID validation fails - Accept
Connection Filtering: Cleared the rules list; tried adding in the IP range of known problematic domain to the "accept" list (no idea if this would even serve a purpose but gave it a shot anyway with no luck.)
IMF: When blocking messages - Archive
We seem to be receiving email fine from just about every domain and most spam is properly sent to the "BadMail" folder on the server. For some reason, all messages from the domains we cannot receive email from do not show up anywhere. This has been going on for several months now.
Appreciate any help I can get here!