How do postfix logs show emails marked as spam in centos7?

Question

postfix

Good afternoon!
The user complains that he does not receive letters from one sender. The sender advises checking spam filters and excluding him from the villains. There is a suspicion that the sender is lying and did not send anything. You cannot force the sender to send an email for verification right now. Where can I see (in what logs) that messages are marked as spam? I see in /var/log/maillog that letters from the desired sender are coming, but to a different addressee. I can't find the complaining user. I don't know how the filter is configured. Familiar with postfix second week. Now there is no task to allow / change the settings, now we need to find out whether someone really sent something or not. And if sent, then where it was reflected.

Answer 1

No way. Postfix is ​​an SMTP server, its task is not to tag or not tag messages. Emails can be tagged either by a separate anti-spam on the server, or by the mail program itself, and as a rule, the latter happens - the mail program sends letters to the "Spam" folder :)

Answer 2

Looking what samfiltr is worth.
For example like this:

Feb 14 21:10:14 pmg pmg-smtp-filter[2063]: 182DDE5A847B869856B: new mail message-id=<[email protected]>
Feb 14 21:10:15 pmg pmg-smtp-filter[2063]: 182DDE5A847B869856B: SA score=6/5 time=0.829 bayes=undefined autolearn=no autolearn_force=no hits=FROM_EXCESS_BASE64,HTML_IMAGE_ONLY_08,HTML_IMAGE_RATIO_02,HTML_MESSAGE,HTML_SHORT_LINK_IMG_1,RCVD_IN_MSPIKE_BL,RCVD_IN_MSPIKE_L5,SPF_HELO_PASS,SPF_PASS,T_RP_MATCHES_RCVD,URIBL_BLOCKED
Feb 14 21:10:15 pmg pmg-smtp-filter[2063]: 182DDE5A847B869856B: moved mail for <[email protected]> to spam quarantine - 182DE15A847B878A5E9