Utility tools

Free Email Tools

Use SMTP Zen’s free DMARC checker and policy generator to inspect email authentication, create safer DNS records and improve your domain’s deliverability.

DMARC Policy Checker

Analyze a domain DMARC policy and interpret each tag for alignment and reporting.

DMARC Policy Generator

Generate a DMARC policy with safe defaults, alignment settings, and reporting options.

More tools coming soon

We are adding more free deliverability and DNS utilities. Check back for new tools.