Bug#946540: Warning: No server certificate defined; will use a selfsigned one.

[積丹尼 Dan Jacobson]

Package: exim4-config
Version: 4.93~RC7-1

Users are now seeing this problem as mentioned in
https://lists.exim.org/lurker/message/20180602.193522.d632778a.en.html

> /var/log/exim4/mainlog has 166 of it's 305 lines occupied with:
>
> Warning: No server certificate defined; will use a selfsigned one.
> Suggested action: either install a certificate or change tls_advertise_hosts option

In /usr/share/doc/exim4-config/ please add instructions on what users
should do about it.