[Mailman-Developers] Fixing DMARC problems with .invalid munge

[Stephen J. Turnbull]

Quoth Mark Sapiro:

 > >Exactly how to patch this depends on what Mailman version you're
 > >starting with, but you basically want some code like this.

snip

John Levine writes:

 > How do you limit it to just addresses with DMARC problems?  There's no
 > benefit to doing it to everyone.

Probably a hard-coded regexp (or list thereof) matching against the
address in "From".  The OP has a special situation where he's got lots
of local mods to Mailman, so it's not convenient to upgrade.  So he
wants a quick and dirty approach, and he also knows enough Python that
he can work out the details for himself.