Jaroslaw Rafa via Postfix-users:
> Dnia 19.06.2023 o godz. 16:53:58 Anton Hvornum via Postfix-users pisze:
> >
> > Thank you, yes that one slipped by me entirely.
> > I'll have to re-evaluate how to mark mails as spam with multiple
> > headers when SPF is not passing then.
>
> To add multiple headers, it is best to use milter, not a policy service.
> However, milters are harder to write.
Indeed, there is a bit of a learning curve. Fortunately, there is
a Milter library for many programming languages: Perl, Python, Rust,
Java, C/C++, PHP, and there are many examples on the Internet.
Wietse
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