AY Mail 2. Professional and Corporate Editions
When you send a message and the addressee cannot be found,
the mail server will send you a notification that explains why
the recipient address is undeliverable. We will refer to such
notifications as bounces. People frequently change their email
addresses and therefore it is very common for some addresses to
become undeliverable, so if you are sending mail to many
recipients you should be ready to receive bounces.
AY Mail can handle bounces automatically through
AY Track. AY Track
automatically recognizes bounces produced by many popular
mail servers, so it will process 95% of the bounces.
AY Track is very selective. It will not touch the bounces
unless they are sent in response to AY Mail mailings.
See How to handle bounces