On Mon, Aug 24, 2015 at 03:53:24PM +0200, Hans Ginzel wrote:

> >If it is a few users, use header_checks. If it is many users,
> >use a Milter (available in Python, Perl, C).
> 
> Thank you.
> 
> Few users. I added
>       header_checks = pcre:/etc/postfix/header_checks
> to /etc/postfix/main.cf.

And tested that it is set?  (Hint: "postconf -n header_checks").
And made sure that header_checks has no overrides in the relevant
master.cf cleanup entry?

> I added into /etc/postfix/header_checks
>       /^From(.*)/ WARN $1

And tested via

    postmap -fq "From: Joe User <joe.u...@example.com>" 
pcre:/etc/postfix/header_checks

before sending email?

> I sent some e-mails, looked in /var/log/maillog, found messages like
> "(delivered to mailbox)", "removed"; but did not find any warning
> messages. Where they were gone, please?

Check your syslog configuration.

-- 
        Viktor.

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