A bounce address is a type of return path in which an email address message cannot be delivered to the recipient because the email does not exist, the recipient changed hosts, the recipient has blocked the message and/or the MTA sent it to the address given by the MAIL FROM command which has many variants of the name, none of them used universally, including return path, reverse path, envelope from, envelope sender, MAIL FROM, 5321-FROM, return address, From_, Errors-to, etc.
For more information visit: Everything You Need To Know About Bounces
For more information visit: Everything You Need To Know About Bounces