Required System Administration freelancer for Configure mail server and remove google spam filter issue, marking our emails as spam job

We have our private email server configured to send our clients notification emails. Google is marking our emails as spam. We did DKIM, SPF configuration for domain name, but emails are still marked as spam

Job qualities:
- Linux system administration
- Email server configuring ( clamd, sogo, mailcow)
Abilities:
- Email server configuring
- Google spam issue fixing

The job is paid with 50 dollars.

Skills & Expertise Required

System Administration