[Mailman-Users] munging the To: line?

I've searched the archives and the FAQs; if I've missed something please point me to it.

I've got From: munging turned on, so posts to a list I administer come "from" addresses like John Smith via mylist <mylist@example.com>

Frequently, list users will post to the list by replying to a previous message, and I'll end up getting a message with a To: header like

To: John Smith via mylist <mylist@example.com>

and it goes out to the list with that To: header.

Since this can be confusing, I'd like to munge the To: line as it comes through so it ends up saying

To: My List <mylist@example.com>

Is there a way to do this through standard configuration options (and how?), or do I need to write a handler?

Joe Pfeiffer 575.525.2764 (H) 1440 Tierra del Sol Dr 575.496.3501 (C) Las Cruces, NM 88007-5548