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

[John Levine]

>> How do you limit it to just addresses with DMARC problems?  There's no
>> benefit to doing it to everyone.
>> 
>Because a DMARC record is published in DNS, Mailman must use a Python
>module capable of querying DNS.  MM 2.1.18 uses the dnspython
><http://www.dnspython.org/> package for this.  I believe PyDNS will also
>work.

Well, yes, obviously.  Since DNS checks can be slow, it would be nice
to reuse the answers that Mailman probably already has.  Where are
they stored?

R's,
John