A catch-all e-mailbox is one that gathers all the emails sent to nonexistent email addresses. For instance, if your email address is firstname.lastname@example.org, but somebody misspells it and sends an email message to email@example.com, it will still be received in the catch-all mailbox that you have set up. Just one mailbox per domain can have this feature activated and in this way you’ll never miss emails because the other party has an obsolete address or has made a mistake. The downside of having a catch-all mailbox is that you may start receiving a lot of spam, but this issue can be solved using an anti-spam protection solution. It’s also important to bear in mind that a mailbox with an activated catch-all feature cannot forward incoming messages to a third-party email address.