What data do deliverability consultants look for in inbox diagnostics?

Deliverability consultants examine multiple data sources:

Authentication audit: SPF, DKIM, DMARC configuration and alignment.

Reputation data: Postmaster tools, SNDS, third-party reputation services.

Engagement analysis: Open, click, complaint rates over time and by segment.

Content review: Spam trigger analysis, URL reputation, template evaluation.

List quality assessment: Bounce rates, hygiene practices, acquisition sources.

Sending patterns: Volume consistency, warming history, infrastructure setup.

Provider-specific investigation: Deep dive into problem providers.

A thorough diagnosis examines the ship, cargo, crew, and voyage history before prescribing repairs.