Bug#949482: exim4-config: Please drop the pointless warning "Warning: No server certificate defined; will use a selfsigned one."

[Francesco Poli]

On Tue, 21 Jan 2020 13:55:20 +0100 Vincent Lefevre <vincent at vinc17.net>
wrote: [...]
> Each time I upgrade exim4, I get:
> 
> Setting up exim4-config (4.93-9) ...
> 2020-01-21 13:27:26 Warning: No server certificate defined; will use a selfsigned one.
>  Suggested action: either install a certificate or change tls_advertise_hosts option

It is also written to /var/log/exim4/mainlog at *each* queue run (thus
twice per hour).

> 
> I suppose that this is pointless, thus this warning should be dropped.
> Users do not be spammed by useless messages.

I am also under the impression that this warning should be muted, at
least when

  $ grep interfaces /etc/exim4/update-exim4.conf.conf 
  dc_local_interfaces='127.0.0.1 ; ::1'

The rationale is: if my exim only listens to the loopback interface,
then I don't need a server certificate, since my exim won't accept
connections from remote clients.
Does this make sense?


-- 
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..................................................... Francesco Poli .
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