A catch-all e-mailbox is one that gathers all the messages sent to nonexistent addresses. For example, if your email address is firstname.lastname@example.org, but someone mistypes it and sends an email to email@example.com, it will still be received in the catch-all mailbox that you have created. Just one mailbox per domain can have this feature activated and in this way you’ll never miss messages because the other party has an outdated address or has made a typographical error. The downside of configuring a catch-all mailbox is that you may start receiving plenty of junk emails, but this problem can be fixed using an anti-spam filtering solution. It is also important to bear in mind that a mailbox with an active catch-all functionality cannot forward inbound messages to a 3rd-party email address.