[CentOS] Postfix question: How to reject email with a certain subject header

Gilbert Sebenste wrote:
> Hello everyone,
>
> Occasionally I get emails which have a subject header of "Rejected posting
> to Blah", from a listserv I am on. Without going into a 10 page diatribe
> of why, I'd like to reject these automatically, sending them to /dev/null.
> I used to run Sendmail and that was pretty easy to do. How can I do this
> under Postfix under CentOS 5.3?

Do you want to reject them or eat them and send them to /dev/null ?

If you want to reject them something like this would work:

header_checks = regexp:/etc/postfix/regexp_table

and in /etc/postfix/regexp_table something like:
/^Subject: This is the subject I want to reject             REJECT 554
Custom rejection message

nate