“Mail bounce settings”. When somebody sends an email message to an email address that does not exist under your domain, the mail server, by default, accepts mail, processes it, and when it finds out that there is no such a recipient under the domain, it returns the mail back to sender with an error message. You can choose to:
- Continue returning all such mail back to senders (“Bounce with message” option).
- Forward all such mail to the specified email address (“Forward to address” option). This is also referred to as a catch-all address.
Note that if the outgoing mail control is turned on by your hosting provider, the forwarding address must belong to the same domain for which you are modifying mail bounce settings. If you need to specify an external email address (that is, outside the domain) or set one address for multiple domains, please contact your hosting provider.