Lately I receive a lot of
Delivery Status Notification (Failure) e-mails.
Bogus spam email is sent from
blablaxx@mydomain to other emailadresses, and bounce back to my catch-all
info@mydomain with above error-message.
Off course the
blablaxx@mydomain email-addresses are non-existing and AFAICS the emails are sent from different foreign ip-addresses.
I've setup a DNS txt SPF record, but that doesn't seem to help much.
What can I do more?