Free Tools

Simple, free tools to validate and audit your email authentication setup and deliverability. No signup required.

1. Basics — Record Checkers

Start here. Look up and validate the core DNS records that control email authentication.

Look up and validate your domain's DMARC record. See if it's published correctly and what policy is enforced.

Inspect your SPF record for syntax errors, lookup limits, and authorized senders.

Verify DKIM selector records and ensure your domain is signing email properly.

Look up the MX records for any domain and verify mail routing.

Build correct records the first time, with guided generators.

Build a valid SPF record by selecting your email services, with automatic lookup-limit counting.

Step-by-step builder for your DMARC record (p=, rua=, pct=, sp=).

Investigate delivery issues and see how mailbox providers view your domain.

Check your domain's sending reputation across major email providers and blocklists.

Paste raw email headers to see SPF, DKIM, DMARC results and the delivery path.

Count DNS lookups in your SPF chain and spot the 10-lookup limit before it breaks auth.

Tools for teams running DMARC in production and tightening policy safely.

Identify who's sending on behalf of your domain and classify each source.

See the impact of moving from p=none to quarantine or reject before you change it.

Upload a DMARC aggregate (RUA) XML file to view it in a readable format.

Nice-to-have checks for inbox branding and encrypted transport.

Validate your BIMI record and VMC certificate so your logo shows in inboxes.

Verify TLS reporting and MTA-STS policies for encrypted email transport.

Get automated aggregate reports, sender classification, and policy rollout guidance with Safer Sender.