My brother @andreas-lehr.com wrote a blog post about his learnings about email reputation.
Happy for any feedback 📥
we-manage.de/en/blog/emai...
we-manage.de
Email Reputation: Separate Use-Cases on Subdomains
Why dedicated subdomains for transactional, newsletter and employee mail are essential — with SPF, DKIM, DMARC per stream and EU-based service provider alternatives.