Email Monitoring and Deliverability Diagnosis

You cannot fix what you cannot see. Monitoring is the feedback loop that tells you whether your authentication, content, and list quality are actually working, and alerts you when something breaks before it becomes a serious reputation problem.

Related skills: authentication/SKILL.md (fixing SPF/DKIM/DMARC when monitoring reveals failures), list-hygiene/SKILL.md (fixing bounce and complaint rates), marketing-campaigns/SKILL.md (interpreting per-campaign metrics)

Tools to Set Up on Day One

These are non-negotiable if you send more than a few hundred emails per month.

Google Postmaster Tools

URL: postmaster.google.com