Why Postulate Developers Features

Domain Health Check Run all email security checks at once — MX, SPF, DKIM, DMARC, and more

DNS Records

MX Checker Mail server priorities and providers SPF Checker Sender policy and DNS lookup count DMARC Checker Domain reporting and alignment policy

Authentication

DKIM Checker Signing keys and selector config BIMI Checker Brand logo and certificate setup MTA-STS Checker Strict transport security policy

Deliverability

Blacklist Checker IP and domain DNSBL listings TLS-RPT Checker SMTP TLS reporting records

Utilities

SVG to BIMI Convert logos to Tiny PS format

Imprint

About

Postulate is a pre-launch project building EU-hosted email infrastructure.

Contact

General: hi@postulate.eu

Abuse: abuse@postulate.eu

Free Tools

Domain Health Check MX Checker SPF Checker DMARC Checker DKIM Checker BIMI Checker MTA-STS Checker TLS-RPT Checker Blacklist Checker SVG to BIMI

Company

Privacy Policy Abuse Policy Imprint

© 2026 Postulate. Proudly built in Norway.