Download cPanel User Guide - Fasthosts Customer Support

Customer Support | cPanel User Guide
Step 2
If you want to use the email address you have with an email client click the Yes button and
then click Next Step.
Set Default Address
The next step lets you chose what to do with mail that comes into an address that does not
exist on the domain.

Discard with error to sender (at SMTP time) – Select if you want the mail to be
discarded.
o
Failure Message (seen by sender) – You can specify a custom message that
will be sent back to the sender when they have attempted to contact an
invalid email address.
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