Exim4 problem?

[Charlie <taoquester@gmail.com>]

Received this on attempted upgrade:

systemctl status exim4.service
● exim4.service - LSB: exim Mail Transport Agent
   Loaded: loaded (/etc/init.d/exim4; generated; vendor preset: enabled)
   Active: failed (Result: resources) since Fri 2017-04-14 10:24:05
AEST; 4min 44s ago
     Docs: man:systemd-sysv-generator(8)
  Process: 9436 ExecStart=/etc/init.d/exim4 start (code=exited,
status=0/SUCCESS)

Assume nothing I can do? Something that needs to be done higher up the scale?

Can't uninstall or purge exim4 either.

Be well,
Charlie