It started as an operator error, albiet an unexpected one. I had 3 IP addresses for our mailserver, one "primary" which receives mail "from outside", one "internal", and I added another, to which I pointed secondary MX to, in order to test postscreen.
So it worked quite well for some time, and I decided to switch primary MX (the same host!) to use postscreen too. So I added second postscreen line into main.cf, with the primary MX IP, and the rest of the line being the same as for the other postscreen entry. I watched it for a while, it all worked well. But at the next day I found out that our mailserver is at higher than usual load and our maillog is filled up (2Gb without O_LARGEFILES). First problematic log series was small: Apr 2 07:18:36 isrv postfix/postscreen[27447]: warning: database /var/lib/postfix/postscreen_cache.db: could not delete entry for 196.203.156.75 Apr 2 07:18:36 isrv postfix/postscreen[27447]: warning: database /var/lib/postfix/postscreen_cache.db: could not delete entry for 204.110.60.86 Apr 2 07:18:36 isrv postfix/postscreen[27447]: warning: database /var/lib/postfix/postscreen_cache.db: could not delete entry for 41.68.21.167 Apr 2 07:18:36 isrv postfix/postscreen[27447]: cache /var/lib/postfix/postscreen_cache.db full cleanup: retained=765 dropped=5 entries But second series is where the problem started: Apr 3 00:34:03 isrv postfix/postscreen[1817]: warning: database /var/lib/postfix/postscreen_cache.db: could not delete entry for 213.136.166.127 Apr 3 00:34:03 isrv postfix/postscreen[1817]: warning: database /var/lib/postfix/postscreen_cache.db: could not delete entry for 213.254.94.254 Apr 3 00:34:03 isrv postfix/postscreen[1817]: warning: database /var/lib/postfix/postscreen_cache.db: could not delete entry for 213.136.166.127 Apr 3 00:34:03 isrv postfix/postscreen[1817]: warning: database /var/lib/postfix/postscreen_cache.db: could not delete entry for 213.254.94.254 Apr 3 00:34:03 isrv postfix/postscreen[1817]: warning: database /var/lib/postfix/postscreen_cache.db: could not delete entry for 213.136.166.127 Apr 3 00:34:03 isrv postfix/postscreen[1817]: warning: database /var/lib/postfix/postscreen_cache.db: could not delete entry for 213.254.94.254 Apr 3 00:34:03 isrv postfix/postscreen[1817]: warning: database /var/lib/postfix/postscreen_cache.db: could not delete entry for 213.136.166.127 Apr 3 00:34:03 isrv postfix/postscreen[1817]: warning: database /var/lib/postfix/postscreen_cache.db: could not delete entry for 213.254.94.254 Apr 3 00:34:03 isrv postfix/postscreen[1817]: warning: database /var/lib/postfix/postscreen_cache.db: could not delete entry for 213.136.166.127 Apr 3 00:34:03 isrv postfix/postscreen[1817]: warning: database /var/lib/postfix/postscreen_cache.db: could not delete entry for 213.254.94.254 Apr 3 00:34:03 isrv postfix/postscreen[1817]: warning: database /var/lib/postfix/postscreen_cache.db: could not delete entry for 213.136.166.127 [.....] This goes on and on and on, it is sitting there trying to remove the two entries ad infinitum, but meanwhile processes incoming connections -- so email works still. libdb used is this one: ii libdb4.8 4.8.30-2 Berkeley v4.8 Database Libraries [runtime] and postfix is 2.8.2. I haven't tried to debug the issue yet, -- had no time to investigate when it happened, I just removed second postscreen entry and postscren_cache.db (the latter were recreated on next restart). So this is just a heads-up for now, without any useful information. Hopefully I'll be able to provide something in a few days. Thanks! /mjt
