After a bounce occurs for a recipient's email address, Pabau stops attempting delivery of the email. Further email to that address will be rejected temporarily.
Pabau utilises a set of heuristics to determine whether a bounce should be classified as a soft or hard bounce.
Permanent errors such as invalid mailboxes will get classified as hard bounces, while quota errors and other temporary problems are treated as soft bounces.
Hard bounce rejections last longer than soft bounce rejections, and Pabau doesn't automatically convert soft bounces to hard bounces. If you're seeing a lot of soft bounces to an address, it may be a sign that the address is unusable.