A catchall address is a designated mailbox where any email sent to a non-existent email address will be delivered. To better help explain catchalls, review the example below:
You have the following mailboxes setup on your account:
Now in this example, any email sent to john@yourdomain.com would be delivered to that corresponding mailbox.
The same would hold true for any email sent to bill@yourdomain.com. However, what would happen if an email was sent to "frank@yourdomain.com"?
Because the mailbox frank@yourdomain.com has not been setup in the system, normally the email would be rejected with a "user unknown" message and would be returned to the sender. However, if you have a catchall setup, like in the example above, the email would be delivered to the catch-all mailbox. This would hold true for email sent to any other addresses which have not been setup as mailboxes on the system.
To set up a catchall email account for a particular domain:
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