SPAM probléma, CentOS, Cpanel

Üdv!

Sajnos egy nemrég telepített mailszerverről a levelek gmailes fióknál spambe érkeznek. Tudtommal minden jól be van állítva, de úgy tűnik mégsem. DKIM, SPF, DMARC, rendben van.
teljesen tanácstalan vagyok hol keressem a hibát.

Alább látható a SPAM-be érkezett levél. (az ip címek és hostok, csak minta adatok)

A szerveren CentOS 7 és Cpanel van.

Tud valaki segíteni, hogy mi lehet a probléma?


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