> On Jun 9, 2019, at 12:42 AM, Webmaster
> <webmas...@lshipping.klaipedaville.com> wrote:
>
> OK. This is gmail.com and the sequence / order of its headers is always the
> same isn't it? Plus, that is always the same user, always the same email
> address, always the same "empty" subject field and always the same recipient
> all the time. Now according to your explanation could you advise me please,
> how do I set it to check the subject field first and to stop the query right
> there without letting it go through any further rules? Thanks.
The answer is simple. Postfix header checks DO NOT support any sort
of multi-header conditionals or logic that depends on the order in
which headers are checked against the rules. Each header is tested
*in isolation* and whatever order the headers happen to appear in
the message.
For anything fancier you need a content filter or milter (a Sieve
milter would do the job). What you're trying to do CANNOT be done
with the built-in content inspection in Postfix.
--
Viktor.
