* Corey via Postfix-users:

> /racknerd\.com/ reject
>
> will this be working?

It should work, blocking all envelope senders containing the substring
"racknerd.com" anywhere. If that is too general a match for you, and
based on your example, you could also use

  /racknerd\.com=support@pobox\.be$/ reject

This matches envelope senders which end with the given pattern only.
If you are unsure, "postmap -q ..." is very helpful for tests, as the
Postfix documentation mentions.

-Ralph
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