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

[SM]

Hi John,
At 08:16 04-05-2014, John Levine wrote:
>The .invalid hack seems fine, no bounces, and no complaints about
>disappearing mail.  There are mutant versions of this hack where you
>append a name with a wildcard that resolves but has an MTA that
>rejects all the mail, and a really evil one where you append a name
>that points to a server that rewrites the address and remails it, e.g.
>mmeyer at yahoo.com.remail.lists.org -> mmeyer at yahoo.com.
>
>For replies, I expected complaints, since I'm using it on some busy
>lists for my church where people complain about every little burp, but
>to my surprise I've gotten none.  I think one reason is that you can
>still use an unmunged Reply-To, which a lot of users do, and the other
>is that it's pretty obvious what to do to get the address to work,
>unlike trying to guess the author's address if the From: is the list.

Was there any occurrence of the ".invalid" in replies which were 
posted to the mailing list [1]?

Regards,
-sm

1. I assume that it would be caught on message submission.  I am 
asking the question as what happens in practice might be different.