problems with mail

[Jeff Vian]

We recently had an extended power outage at a remote site and one of my 
servers was shutdown hard.

After power was restored (3 days later) and it came back up I have been 
having problems with mail.
I first noticed it when my daily logwatch reports were no longer being sent.
On further investigation I find that I cannot even send mail from one 
user to another on the same box.  

I have done a complete update, replaced procmail and sendmail, rechecked 
all the configs in case something had gotten hosed, and rebooted several 
times as well as restarting services.  Nothing has worked so far.

Does anyone have pointers on where to look for this type problem?