Deliverability Check

Audit a sending domain's email authentication and deliverability posture. Explains every finding in plain English and outputs a prioritized fix order — critical for anyone whose open rate dropped and doesn't know why.

Usage

/deliverability-check brand.com — audit the domain /deliverability-check brand.com news.brand.com — include a sending subdomain

Works with

Steps 1–9 need only DNS and the web: zero accounts. If an ESP is connected through Cogny (mcp__cogny__list_integrations), Step 8b adds the bounce, complaint and unsubscribe rates that DNS can't show.