BATV would reduce/eliminate bounced messages from messages you didn't send, but your email address was used as the sending or reply to address. See: https://en.wikipedia.org/wiki/Bounce_Address_Tag_Validation
Every week or so we have an unlucky customer whose email address gets picked up by a spammer (or malware) and it blasts out thousands of messages to random people. Our customer receives hundreds of undeliverable messages because the recipient doesn't exist, mailbox full, etc.
BATV would be a nice feature to add. Thumbs Up!