A catch-all mailbox is one that gathers all the messages sent to invalid email addresses. For instance, if your email address is info@domain.com, but someone misspells 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 single mailbox per domain can have this feature activated and thus you’ll never miss messages because the other party has an out-of-date address or has made a spelling mistake. The drawback of having a catch-all mailbox is that you may begin receiving a lot of unsolicited emails, but this problem can be fixed using an anti-spam filtering solution. It is also vital to remember that a mailbox with an active catch-all functionality cannot redirect inbound email messages to a 3rd-party email address.