Why does the same email end up in spam from outlook and not from google apps?

Question

Google Workspace

I encountered a strange situation - the same text sent from the gmail google apps web interface reaches the addressee on gmail, and the same text sent from outlook (ms office) via the Google smtp server gets spam. Despite the fact that the headers of both letters are almost identical in structure, Received-SPF: pass (google.com: domain of ********.ru designates 209.85.215.65 as permitted sender) client-ip=209.85 is everywhere. 215.65;
The Received: field is different in the headers, but I checked my ip address issued by the provider, it is not blacklisted by mailers.
Let me explain that it is the Google mailer itself that recognizes the letter as spam. The recipient is a normal gmail user.
1) How can I configure Outlook so that the letter does not fall into spam? Obviously, these are Outlook settings, and not the body of the letter itself.
2) Is it possible to somehow specify the DKIM settings in Outlook?

Answer 1

1) In general, spam cutters react to the body of the letter. The client in this case is not important.
2) No, this is indicated on the mail server that sends the letter.
IMHO Trouble is still in the address of the provider.

Answer 2

Most likely, mailers in this case react to the fact that the letter was sent physically from the "left" host - your home machine probably does not have DNS records and hostname configured.
This is an incorrect check, but ce-la-vie.
Dkim is configured entirely on the server, nothing needs to be configured on the client.