How does MailinglistPro Handle Bounces?
MailingListPro uses a method called Variable Envelope Return Path (VERP) to code the return path headers of all e-mail sent from the system.
This is why a subdomain is required so that you do not have to worry about setting the catchall account to pipe to a script.
The return path header looks like this: user-12345@subdomain.yoursite.com this allows for exact bounce catching.
The system will mark any e-mail that bounces 2 or more times as bounced and will not send any further e-mails to that email address.
Any Confirmation e-mail that bounces is automatically marked as bounced.
If your host does not allow the setting of the catchall, ask them to turn it on for you, most will.