I joined a mailing list with an SG address. This list is run by Google Groups, and messages from the list use the actual sender in the To field, not the list's address. So there's not a single address (or even domain) that I can add to the trusted senders.
I don't want to add each list user as a trusted sender, since they come and go at random. Is there a good way to manage this sort of situation with SG?
<<edit>> Sorry, I mean they use the sender address in the From field, not the To field.