A catch-all email mailbox is one that gathers all the email messages sent to nonexistent addresses. For example, if your email address is firstname.lastname@example.org, but someone misspells it and sends a message to email@example.com, it will still be received in the catch-all mailbox that you have configured. Just one mailbox per domain can have this feature enabled and in this way you’ll never miss emails because the other side has an obsolete email address or has made a typo. The drawback of setting up a catch-all mailbox is that you may start receiving lots of unsolicited messages, but this issue can be resolved using anti-spam protection software. It is also crucial to bear in mind that a mailbox with an active catch-all functionality cannot forward incoming emails to a 3rd-party address.