A catch-all e-mailbox is one that captures all the messages sent to nonexistent addresses. For example, if your email address is firstname.lastname@example.org, but someone mistypes it and sends an email to email@example.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 in this way you will never miss messages because the other party has an obsolete email address or has made a spelling mistake. The negative aspect of setting up a catch-all mailbox is that you may begin receiving lots of unsolicited email messages, but this problem can be fixed using an anti-spam filtering solution. It’s also vital to keep in mind that a mailbox with an active catch-all functionality cannot forward incoming messages to a 3rd-party mailbox.