Mail stopped working

Hi,
I have a server running Debian 8. I set it up with the howto: The Perfect Server - Debian 8 Jessie (Apache2, BIND, Dovecot, ISPConfig 3) and it worked flawlessly for about 7 months now.
last night my mail stopped working. the mail.warn log shows that it must be something with Amavis and Postifx, it shows many entries like the following:

Code:

Jul 20 16:46:17 rincewind amavis[2922]: (02922-06) (!)ClamAV-clamd av-scanner FAILED: run_av error: Too many retries to talk to /var/run/clamav/clamd.ctl (All attempts (1) failed connecting to /var/run/clamav/clamd.ctl) at (eval 99) line 613.\n
Jul 20 16:46:17 rincewind amavis[2922]: (02922-06) (!)WARN: all primary virus scanners failed, considering backups
Jul 20 16:46:31 rincewind amavis[2922]: (02922-07) (!)connect to /var/run/clamav/clamd.ctl failed, attempt #1: Can't connect to a UNIX socket /var/run/clamav/clamd.ctl: No such file or directory
Jul 20 16:46:32 rincewind amavis[2922]: (02922-07) (!)connect to /var/run/clamav/clamd.ctl failed, attempt #1: Can't connect to a UNIX socket /var/run/clamav/clamd.ctl: No such file or directory
Jul 20 16:46:32 rincewind amavis[2922]: (02922-07) (!)ClamAV-clamd: All attempts (1) failed connecting to /var/run/clamav/clamd.ctl, retrying (2)
Jul 20 16:46:38 rincewind amavis[2922]: (02922-07) (!)connect to /var/run/clamav/clamd.ctl failed, attempt #1: Can't connect to a UNIX socket /var/run/clamav/clamd.ctl: No such file or directory
Jul 20 16:46:38 rincewind amavis[2922]: (02922-07) (!)ClamAV-clamd av-scanner FAILED: run_av error: Too many retries to talk to /var/run/clamav/clamd.ctl (All attempts (1) failed connecting to /var/run/clamav/clamd.ctl) at (eval 99) line 613.\n
Jul 20 16:46:38 rincewind amavis[2922]: (02922-07) (!)WARN: all primary virus scanners failed, considering backups

I checked if clamav-daemon was running with service clamav-daemon status, which gave me:

Code:

● clamav-daemon.service - Clam AntiVirus userspace daemon
   Loaded: loaded (/lib/systemd/system/clamav-daemon.service; enabled)
   Active: failed (Result: start-limit) since Wed 2016-07-20 16:18:04 CEST; 44min ago
     Docs: man:clamd(8)
           man:clamd.conf(5)
           http://www.clamav.net/lang/en/doc/
  Process: 2580 ExecStart=/usr/sbin/clamd --foreground=true (code=exited, status=1/FAILURE)
Main PID: 2580 (code=exited, status=1/FAILURE)

Jul 20 16:18:04 rincewind clamd[2580]: ERROR: Parse error at line 11: Unknown option AllowSupplementaryGroups
Jul 20 16:18:04 rincewind clamd[2580]: ERROR: Can't open/parse the config file /etc/clamav/clamd.conf
Jul 20 16:18:04 rincewind systemd[1]: clamav-daemon.service: main process exited, code=exited, status=1/FAILURE
Jul 20 16:18:04 rincewind systemd[1]: Unit clamav-daemon.service entered failed state.
Jul 20 16:18:04 rincewind systemd[1]: clamav-daemon.service start request repeated too quickly, refusing to start.
Jul 20 16:18:04 rincewind systemd[1]: Failed to start Clam AntiVirus userspace daemon.

Does anyone have an idea, of how I can fix this?

 

Thanks Till, this seems to have done the trick!
Do you know, how this could happen? After all, the server was running smoothly the last 7 months and this problem never occured before.
Could the cause be an "aptitude update && aptitude safe-upgrade"?

 

You bet! I'm not going to stop updating my servers because of something like this
Again: Thanks! you saved my day yesterday