Bug#860317: upgrade to latest stretch version breaks

[Andreas Metzler]

On 2017-04-17 "Brent S. Elmer Ph.D." <webe3vt at aim.com> wrote:
[...]
> paniclog and mainlog contains this:

> 2017-04-17 14:30:26 IPv6 socket creation failed: Address family not
> supported by protocol

This looks like 610918, i.e. having changed Debian's default default
setup to disable IPv6 without adapting exim4 configuration accordingly.

Are you able to manually start a daemon instance?
update-exim4.conf && exim4 -bd -d

cu Andreas
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