[Pkg-mailman-hackers] Bug#308841: bug 308841

[Maciej Babinski]

There appear to be a few MTAs (GroupWise?) that use dashes in Message-Id's,
and this bug appears to still be present in 2.1.9-9. The attached patch for
pipermail.py works for me -- patching then rebuilding the archive fixes
threading. The patch assumes that Message-Ids are RFC-822 compliant in that
each Message-Id has exactly one "@" sign in it -- this seems like a better
assumption than assuming that "-" characters aren't used. Mangling the
message ids themselves doesn't seem like a good idea, as that may break
uniqueness.

Maciej Babinski
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