Various error messages (broken pipe, table lookup problem)

For more than a year now, we are running a mail server based on the ISPmail tutorial for Debian Lenny. All worked perfectly, but for a few weeks now we are experiencing different problems and strange log entries.

One thing is that we get the following message in mail.err every few minutes:

 

Dec  6 14:53:54 postmaster amavis[32603]: (32603-01) (!!)TROUBLE in process_request: Error writing a SMTP response to the socket: Broken pipe at (eval 83) line 957, <GEN29> line 138.
The other message that we get occasionally is the following:
Dec  6 13:16:14 postmaster postfix/trivial-rewrite[29922]: fatal: mysql:/etc/postfix/mysql-virtual-mailbox-domains.cf(0,lock|fold_fix): table lookup problem
Sometimes, mail messages are not received by the server and the redirections (aliasses) do not seem to work properly. Restarting postix and amavis normally solves the problem until the latter log entry appears again.
 
To mention: We are running this on an OpenVZ virtualized machine, which should have resources enough.
 
Any help is greatly appreciated!
 
Thanks a lot,
Remo

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