(re)start) "exim4" service: paniclog has non-zero size

[^rooker]

[PROBLEM]
I ran a "dpkg-reconfigure exim4-config" to configure exim4 as mail relay.
Everything fine, but whenever I tried to start/stop/restart exim4 service, I got the following error message:

ALERT: exim paniclog /var/log/exim4/paniclog has non-zero size, mail system possibly broken

[SOLUTION]
The first thing to do is to look in the paniclog (since it has *non* zero size )
In there I found:

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2014-11-27 11:37:35 socket bind() to port 25 for address ::1 failed: Cannot assign requested address: daemon abandoned

Since I had IPv6 disabled on my Debian machine, Exim4 failed to bind to "::1" (obviously).
Edit the following line in "/etc/exim4/update-exim4.conf.conf":

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dc_local_interfaces='127.0.0.1 ; ::1'

Remove the "; ::1" and restart Exim.

Voila! ALERT-message gone