Bug#610918: exim4 fails to start without ipv6

[Sven C. Dack]

Hello,

I'm seeing the same bug here now. For some reason did this not matter in the 
past, but as of last update does Debian fail to install exim4 due to the 
disabled ipv6.

Why does exim4 all of a sudden require ipv6? I'm not interested in ipv6 and 
would appreciate it if Debian didn't make this a requirement.


Setting up exim4-daemon-light (4.89-1) ...
Job for exim4.service failed because of unavailable resources or another system 
error.
See "systemctl status exim4.service" and "journalctl -xe" for details.
invoke-rc.d: initscript exim4, action "start" failed.
● exim4.service - LSB: exim Mail Transport Agent
    Loaded: loaded (/etc/init.d/exim4; generated; vendor preset: enabled)
    Active: failed (Result: resources) since Thu 2017-04-13 17:58:50 BST; 5ms ago
      Docs: man:systemd-sysv-generator(8)
   Process: 4192 ExecStart=/etc/init.d/exim4 start (code=exited, status=0/SUCCESS)

Apr 13 17:58:50 debian-linux systemd[1]: Starting LSB: exim Mail Transport A…...
Apr 13 17:58:50 debian-linux exim4[4192]: Starting MTA: exim4.
Apr 13 17:58:50 debian-linux exim4[4192]: ALERT: exim paniclog /var/log/exim…ken
Apr 13 17:58:50 debian-linux systemd[1]: exim4.service: PID file /run/exim4/…ory
Apr 13 17:58:50 debian-linux systemd[1]: exim4.service: Daemon never wrote i…ng.
Apr 13 17:58:50 debian-linux systemd[1]: Failed to start LSB: exim Mail Tran…nt.
Apr 13 17:58:50 debian-linux systemd[1]: exim4.service: Unit entered failed …te.
Apr 13 17:58:50 debian-linux systemd[1]: exim4.service: Failed with result '…s'.

...

2017-04-13 17:58:50 IPv6 socket creation failed: Address family not supported by
  protocol

Note, this was working in the past and without ipv6. It produced the error 
message, but didn't cause an abort of the installation procedure.

Could this be a problem of systemd?

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