Package: exim4-daemon-light Version: 4.92~RC5-1 For the last two upgrades, /var/log/exim4/paniclog: 2019-02-02 21:47:07 socket bind() to port 25 for address (any IPv6) failed: Address already in use: daemon abandoned
As we see from timestamps, it is upgrade related. # ls -dog /var/log/exim4/paniclog /usr/share/doc/exim4-config/examples/ drwxr-xr-x 2 4096 02-02 21:41 /usr/share/doc/exim4-config/examples/ -rw-r----- 1 117 02-02 21:47 /var/log/exim4/paniclog -- debconf information: * exim4-daemon-light/drec: P.S., a cronjob then sends exim paniclog on jidanni2.jidanni.org has non-zero size to the user the next boot.