Ian Bell ian@redtommo.com writes:
OK. I assume lists check the From: field for a valid email address i.e one that is subscribed to the list.
Depends on the list, but doing so makes it *more* likely that someone will want to set a different Reply-To field from there From field (since you might want to subscribe with a different address to one ordinary email is sent to).
So set From: to From. Set to: to recipient and Reply-to: to list and discard the senders Reply-to field.
If the sender needs to set a Reply-To for some reason, this policy makes it impossible for anyone to ever reply to them correctly. So that's no good.