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

[Thaddeus H. Black]

Stand by. Do not act on this bug yet. I had believed that the
heisenbounces had stopped, but now I *seem* to notice another
heisenbounce.

I will investigate. This may take some time. If it develops that the
bug report is not useful, I will close it (unless you yourself have
already done so).

Thanks.