I'm using Postfix 2.7 and I'm trying to setup some header filters.
In main.cf I'm using regexp, not pcre.
header_checks entry:
/^Subject: .*Money/ REJECT
Which rejects an email with the word money in the subjectline. Now what if you want to reject the message if it does _not_ contain the word money? By documentation a prefix exclamation should do it:
!/^Subject: .*Money/ REJECT
but it doesn't work!!
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

I have tried this, but... I would expect the the line

!/^Subject: .*Money/ REJECT

should reject all emails, since all emails will contain a header line which does not match that string.
Is that what you are seeing?

Can you try this...

if /^Subject:/
!/^Subject: .*Money/ REJECT

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
oops typo.... I have NOT tried this..
clark42Author Commented:
Thanks - that's exactly what I was looking for!! :-)
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.