MPro fails with IPv6-only servers (interaction with local DNS resolution)

Since eternal-september seems to have moved on into October, I've been
looking at other news servers with the intent of having at least two from
which I can receive postings.

I found one (read-only) which is only available via IPv6: 
weathergirl-ipv6.tele2.net. Due to local DNS resolution rules,
.moreofthesa.me.uk is being appended to that automatically in an attempt to
find an A record; and my resolver has a wildcard default for that which
points at 192.0.2.1, which is unrouteable and is caught by my firewall.

This creates an interesting situation: MPro does the DNS lookup and is told
192.0.2.1 and 2A00:801:103:10::35. It tries to connect via IPv4, gets an
ICMPv4 “admin prohibited” error from my router/firewall and doesn't bother to
try via IPv6. I've also tested with “network unreachable” and without a local
rule to trap this (in which case my ISP does so instead) with the same
result.

Either I need to change DNS configuration and/or MPro should not give up so
readily in the presence of untried addresses – it looks like it'll fail
similarly given a server which is reachable over IPv6 but (temporarily) not
over IPv4.

I'd also prefer that it tries IPv6 first. ☺

-- 
|  _  | Darren Salt, using Debian GNU/Linux (and Android)
| ( ) |
|  X  | ASCII Ribbon campaign against HTML e-mail
| / \ | http://www.asciiribbon.org/

The effect of lots of alcohol is staggering.

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