How do you build a deliverability diagnostic checklist?

Deliverability diagnostic checklist structure:

Technical checks:

SPF, DKIM, DMARC passing

DNS records intact

Sending infrastructure operational

Reputation checks:

Blocklist status (IP and domain)

Gmail Postmaster reputation

Microsoft SNDS status

Feedback loop complaints

Behavioral checks:

Volume changes (sudden increases)

List composition changes

Engagement pattern changes

Content changes

Analysis:

Bounce code review

Provider-specific patterns

Segment-specific patterns

Timeline correlation

Document and standardize the checklist for consistent diagnosis.

Pre-flight inspection checklist. Systematic review catches issues before guessing.