Learning Center

Catch-all Alias
A catch-all alias is an email account that will catch any email sent to a non-existent email address under your domain name. Instead of bouncing the email back to the sender, it will store the email into the account that is assigned as the catch-all account.

Some hosting companies do not support the catch-all alias. The catch-all alias allows spammers to send unsolicited emails to random email addresses. This creates stress on the mail servers, slowing down the mail server's normal functionality.