Il 2017-11-07 10:10 Matus UHLAR - fantomas ha scritto:
[..]
Thus, messages received from the world will be scored locally, messages
received from backup MX will be scored on backup MX.

Then, your sieve filter will work as expected.

On 09.11.17 16:54, Davide Marchi wrote:
Well, but could I make a Sieve filter that put to (primary server) spam folder all emails marked as spam coming from Backup MX?

you said you do have such filter already.

This is an example source of email-spam coming from backup MX, what element could I use as a unique identifier?:

you should use X-Spam-Status: yes or X-Spam-Flag: NO

X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,
        HEADER_FROM_DIFFERENT_DOMAINS,HTML_MESSAGE,SPF_FAIL,URIBL_BLOCKED
        autolearn=no autolearn_force=no version=3.4.0

Spam detection software, running on the system "server2.sio4.org",
has identified this incoming email as possible spam.  The original
message has been attached to this so you can view it or label
similar future email.  If you have any questions, see
the administrator of that system for details.

this is your problem: your backup MX packs spam to a non-spam mail
set report_safe 0 on backup MX


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Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/
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