If you don't have any custom logic for panic log (i.e. /usr/local/lib/exim4/nonzero_paniclog_hook), you can work around this issue by editing /etc/cron.daily/exim4-base and changing line 18 from:
E4BCD_PANICLOG_NOISE="" to E4BCD_PANICLOG_NOISE="DKIM: Error while running this message through validation, disabling signature verification.$" -- Steve -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to exim4 in Ubuntu. https://bugs.launchpad.net/bugs/721320 Title: DKIM-related failures should not end up in the panic log -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs