Postfix + opendkim + spf= to spam. What's the matter?

Question

Debian

In general, it is worth ispconfig, configured dkim with opendkim for a specific domain. But mail goes to spam. I can't understand why. What are your options?
Maybe because postfix sends Hello with a server name that is not equal to the sender's domain?
dkimvalidator.com says

SpamAssassin Score: 1.851
Message is NOT marked as spam
Points breakdown:
0.0 HTML_MESSAGE BODY: HTML included in message 1.1
MIME_HTML_ONLY BODY: Message only has text/html MIME parts
0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid
only message, but there is no HTML tag
0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid

So DKIM is not valid?

Answer 1

www.mail-tester.com send a letter here, he will give you everything and tell you what to do! If you say something, the result is not clear, I will help. You can directly attach the link of the result

Answer 2

There is also such a service for checking the correct settings of the mail server mxtoolbox.com