I've set up a Google Group and I'm observing some unexpected behavior with the From: address when members email the group. Sometimes From: is set to the sender's name and email address (the desired behavior), but other times I get:
From: 'full name' via My Group Name <firstname.lastname@example.org>
This is masking the sender's email address, making it hard to reply to the sender rather than the list and complicating future searching/filtering. Under what conditions does Google rewrite the From address, and can I change this behavior?