Hello and thank you for your attention.
This is a very strange situation. This is the scenario/rundown:
Server runs SBS 2008 standard. Exchange is hosted locally on server.
What happening is that any time any of the users @rc.com receive an email from @thefloodgroup.com. The email comes through only if it does not contain an attachment. If the email has an attachment, it's never received by rc users. There is no failed to deliver message returning to sender of any sorts, its as if the email is lost in limbo.
Everyone uses Outlook 2003 to connect to exchange localy. I did check the spam folder in outlook, but if it was being caught by spam filter all emails from the floodgroup would end up there.
There is a spam filtering service where i already whitelisted @thefloodgroup.com domain as safe. Once again if this was an issue, i believe that no email form thefloodgroup would come through.
There is local firewall, but i don't believe that's the issue b/c there are no problems with any other email but w/ only with email from thefloodgroup.
How do i determine what the issue is and if the issue is on our end or @thefloodgroup.com end.