A catch-all e-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 misspells it and sends an email to email@example.com, it will still be received in the catch-all mailbox that you have configured. Only one mailbox per domain name can have this feature enabled and thus you’ll never miss messages because the other side has an out-of-date email address or has made a spelling mistake. The disadvantage of having a catch-all mailbox is that you may start receiving lots of spam emails, but this problem can be resolved by using anti-spam filtering software. It is also important to know that a mailbox with an enabled catch-all functionality cannot forward inbound emails to a 3rd-party email address.