A catch-all email mailbox is one that captures all the messages sent to non-existent addresses. For instance, if your address is info@domain.com, but somebody misspells it and sends an email message to inof@domain.com, it will still be received in the catch-all mailbox that you have set up. Just one single mailbox per domain name can have this feature activated and thus you’ll never miss emails because the other side has an outdated address or has made a spelling mistake. The drawback of setting up a catch-all mailbox is that you may start receiving a lot of junk emails, but this issue can be resolved using anti-spam filtering software. It is also essential to keep in mind that a mailbox with an enabled catch-all functionality cannot forward inbound email messages to a 3rd-party address.