A catch-all email mailbox is one that captures all the messages sent to invalid addresses. For instance, if your email address is email@example.com, but someone miswrites it and sends an email to firstname.lastname@example.org, it will still be received in the catch-all mailbox that you have configured. Only one single mailbox per domain can have this feature activated and in this way you’ll never miss messages because the other side has an out-of-date address or has made a typographical error. The drawback of using a catch-all mailbox is that you may begin receiving a lot of spam, but this issue can be solved by using an anti-spam filtering solution. It is also vital to bear in mind that a mailbox with an activated catch-all functionality cannot redirect inbound messages to a 3rd-party email address.