Improve Email Deliverability

I'm seeking an expert to enhance the mail-tester.com score of my email marketing software setup. Currently, my emails are going to spam, and I've already implemented some spam prevention techniques, specifically using a verified sending domain.

Key Tasks:
- Diagnose and fix issues causing spam placement
- Optimize DKIM and SPF settings
- Suggest additional techniques to improve deliverability

Ideal Skills and Experience:
- Proven track record in email deliverability
- Familiarity with mail-tester.com
- Strong knowledge of DKIM, SPF, and email authentication protocols
- Experience with email marketing software