DMARC record validator
Validate your live DMARC DNS record and get a pass/fail checklist for required tags.
Guide
What this tool is for and how to use it
Use this DMARC validator to test your published DNS record and catch common configuration errors.
What this DMARC validator checks
- DMARC record discovery in DNS
- Required tags like
and - Aggregate reporting tag (
) - Overall record validity from MailSlurp tooling
Fixing failed validation
If validation fails, start by checking:
- The record is published at
- The record includes
and a policy tag like - Tags are separated with semicolons and contain no extra quotes
Recommended rollout
Many teams start with monitoring and tighten enforcement over time:
- Publish
with a validaddress to collect aggregate reports - Move to
after alignment is stable - Enforce
once legitimate senders are fully covered
When to run DMARC validation
- Right after publishing DNS changes
- During staged rollouts from
to - After domain migrations or ESP changes