Bad Addreses

If the subscriber addresses doesn't accept e-mail, the message bounces back to the MLM. Some MLM's allows you to configure the list, but this idea isn't always the good one. Almost all addresses bounce occasionally, due to mail host being down, mailboxes being full, or other technical problems addresses aren't deleted until messages bounce 10 times in a row or some similar amount. Many list managers prefer to configure their list that they receive bounce messages, and can decide themselves, based on the reason for the bounce, when and if to unsubscribe the address