I'm a little confused on the difference between the sender address and the envelope address. Does BATV apply to both, or just one? I'll need to read the question carefully to make sure I understand which addresses it's referring to.
I'm pretty confident about BATV. I'm pretty sure the FortiMail device inserts the tag, not the sender. And I think it uses symmetric keys, not public/private. I'll double-check those details, but I feel good about this one.
Okay, let's think this through. I know BATV has something to do with verifying bounce addresses, so I'll focus on that. The key is probably publishing the public key, but I'm not sure if that's required or just an option.
Dino
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