[Mailman-Users] Setting from_is_list on a per-recipient (or domain) basis

Using 2.1.39, would it be a lot of work (and where could I begin) to set from_is_list based on the recipient subscriber; either individually or per-domain?

At this point I'm faced with changing the setting globally because of a single troublesome recipient.

My intuition is that the mixture of recipients would not post a problem for replies, but let me know if I missed anything.

This is a closed system where the majority of mails are received by the same few domains, but there are some outliers.

Fine-grained control would allow me a "minimal intervention" approach in contrast to a sweeping change to behaviour for all users.

Thanks

-- Mark