A catch-all e-mailbox is one that captures all the emails sent to non-existent addresses. For instance, if your email address is firstname.lastname@example.org, but someone mistypes 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per domain name can have this feature enabled and in this way you’ll never miss emails because the other party has an outdated email address or has made a spelling error. The drawback of having a catch-all mailbox is that you may start receiving lots of unsolicited messages, but this problem can be rectified using an anti-spam filtering solution. It’s also important to know that a mailbox with an active catch-all functionality cannot forward inbound messages to a 3rd-party email address.