A catch-all mailbox is one that gathers all the email messages sent to invalid addresses. For example, if your email address is firstname.lastname@example.org, but somebody mistypes it and sends an email message to email@example.com, it will still be received in the catch-all mailbox that you have created. Only one single mailbox per domain name can have this feature activated and thus you’ll never miss messages because the other party has an obsolete email address or has made a spelling mistake. The disadvantage of using a catch-all mailbox is that you may begin receiving lots of spam, but this problem can be resolved using anti-spam protection software. It’s also essential to remember that a mailbox with an activated catch-all feature cannot redirect incoming email messages to a 3rd-party email address.