I've checked bounce handling and there appears to be two pre-installed settings that apply:
"Mailbox does not exist 1" and "Mailbox does not exist 2"
They look identical in the rules
Save message in database
Delete message from mailbox
For some reason it appears like the email keeps getting sent out as I am getting a response email from the recipient over the last couple weeks. (The email was originally sent out late December). Is it because I also need to add "Empty the queue for the user"
2 Do I need both rules?
3 If resends happen, how many times does it retry and how frequently?