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

[Thaddeus H. Black]

> Full details are discussed here
> [http://unix.stackexchange.com/q/308283/18202], where a user named
> Rui F. Ribeiro cleverly discovers the fix.

The bug server's web archived does not seem to like the way I
have formatted that URL.  This may work better: [1].

    [1] http://unix.stackexchange.com/q/308283/18202

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