A catch-all mailbox is one that collects all the messages sent to inactive addresses. For example, if your email address is info@domain.com, but somebody mistypes it and sends an email to inof@domain.com, it will still be received in the catch-all mailbox that you have created. Just one mailbox per domain name can have this feature activated and thus you’ll never miss emails because the other party has an obsolete address or has made a mistake. The downside of setting up a catch-all mailbox is that you may start receiving lots of unsolicited emails, but this problem can be resolved using anti-spam filtering software. It is also essential to remember that a mailbox with an active catch-all functionality cannot forward inbound emails to a third-party email address.