HiI need help as soon as possible....I have a coexistence senario with a EX2003 and EX2007. Also I'm using MXtreme BorderWare for antispam protection. The problem is that I had the settings and everything and it was working fine. The EX2007 and EX2003 users could receive emails Today I don't know why (maybe one of the other administrators changed something) EX2003 users can receive emails but EX2007 cannot get anything. The error that I'm getting when I'm trying from my ISP's email account is that "USER UNKNOWN". Also I'm sure that nothing was changed from MXtreme Borderware. What do you think is the problem?

Where does MXtreme BorderWare deliver mail? To the E2K3 or E2K7 server? I suspect that the mail is being delivered to E2K3 and then it is queuing up to be delivered to E2K7. Make sure that the E2K7 server's Transport service is running and that the disk on which the queue database is located has at least 4GB of free disk space.

MXtreme Borderware delivers the email to EX2007 (which I'm still testing) and then the email is passing to EX2003. On EX2007 I have only my mailbox so theres is not a problem with free disk space. I'm sure that the emails pass through MXtreme because I can see all of the emails of EX2003 passing through but I cannot see any email for EX2007.