I'm running SBS 2003 with Exchange SP2. As of yesterday I can no longer send or receive mail through Exchange to my default domain. I have mail to domain a.com pointed at my server through DNS. I have also been checking mail for domain b.com via POP3. Domain b.com mail comes in fine. Domain a.com is sent from other mail systems but I never receive it in any of Exchange's mailboxes. I've checked event logs and I'm not getting any error messages.
While not best practice, I don't always backup exchange on my personal server. To manage storage I've gotten lazy and deleted the Exchange logs sometimes instead of backing the Information Store up. Normally this hasn't been a problem. But since I did it yesterday morning I haven't received any emails to domain a.com. I must have been sloppy and deleted something I shouldn't have. My information store appears to be intact. Right now Exchange is not giving me any clues as to what's happening to the incoming mail. I know the senders are not getting any delayed message notification. The mail appears to be leaving their server fine. OWA works too.
Is there any way I can see what might be going on here. If worst comes to worst I can go back to my last backup and restore the Information Store. All critical email is stored in PST's too so I won't lose anything. I'm more interested in understanding what might be going on w Exchange and resolving it if possible