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

John R Pierce pierce at hogranch.com
Thu Jun 18 05:15:11 UTC 2009

nate wrote:
> 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

The problem with that approach is that its global to the server.    I 
dislike putting filtering rules like that in the system, and prefer to 
do them on a per user basis, hence my postmailrc suggestion (except I 
don't know if CentOS uses postmail as the delivery agent for postfix)

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