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

Steps

1. Parse the input

Extract the root domain and any subdomains the user wants checked. If only a root domain is given, also check common sending subdomains: mail., news., marketing., email., em., send..