A: Thanks for the query. The catch_all emails basically mean the server is configured to receive emails even if the specific address doesn't exist. The catch-all servers can redirect the emails that were sent to an invalid address to a specific admin email address or they can simply delete them. Sometimes, they can reply to these addresses saying that it doesn't exist (soft bounce). Our system can validate catch-all emails from some service providers. However, by the definition of a catchall, catch-alls from all service providers cannot be validated. Please note that, catchall emails are not invalid and you can decide whether to send emails to them or not based on your email list's quality. Let us know if you have any other questions. Have a great day.