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: (32603-01) (!!)TROUBLE in process_request: Error writing a SMTP response to the socket: Broken pipe at (eval 83) line 957, <GEN29> line 138.
Dec 6 13:16:14 postmaster postfix/trivial-rewrite: fatal: mysql:/etc/postfix/mysql-virtual-mailbox-domains.cf(0,lock|fold_fix): table lookup problem