non-DSN-aware mailer

Wanting to know how to fix this with email read-reciepts:


----- The following addresses had successful delivery notifications ----- <[email protected]> (relayed to non-DSN-aware mailer)

See the 'non-DNS'aware mailer'

How do I fix that to be my domain/mail server?

Where are you getting the notification?

Perhaps this page will help you understand what's going on.

Jeff