Bug#837535: When a relay host lacks an IPv6 interface, mail heisenbounces

[Thaddeus H. Black]

> I would appreciate if you would report this upstream. We might apply
> this patch in Debian without an exim release if upstream accepts it as
> well.

Done. [1]

    [1] https://bugs.exim.org/show_bug.cgi?id=1885