A catch-all email mailbox is one that captures all the messages sent to non-existent addresses. For instance, if your address is firstname.lastname@example.org, but someone misspells it and sends an email to email@example.com, it will still be received in the catch-all mailbox that you have configured. Just one mailbox per domain can have this feature activated and thus you’ll never miss messages because the other party has an out-of-date address or has made a mistake. The disadvantage of having a catch-all mailbox is that you may begin receiving a lot of spam emails, but this problem can be solved using anti-spam filtering software. It is also crucial to remember that a mailbox with an active catch-all functionality cannot redirect incoming emails to a third-party mailbox.