Free SPF & DMARC checkers compared
A neutral, sourced comparison of free SPF and DMARC checking tools — what each one checks, whether it needs a login, and how the results are presented. Feature data is a dated snapshot; verify current details on each provider.
How these tools differ
All six tools here are free to run, need no login for a basic check, cover SPF, DKIM and DMARC, and explain the result in plain English. They differ in what else they check, whether they offer an API, how you share results, and what’s gated behind an account — that’s what the table below focuses on. Relaymetry’s edge: it also checks MX, blacklists and TLS, gives a shareable report, and asks for no login or email.
| Relaymetry | MXToolbox | EasyDMARC | dmarcian | DMARCLY | MailGenius | |
|---|---|---|---|---|---|---|
| Also checksbeyond SPF · DKIM · DMARC | MXBlacklistTLS | MXBlacklistTLS | MXBlacklistTLS | MXBlacklistTLS | MXBlacklistTLS | MXBlacklistTLS |
| Public API | No | Yes | Yes | No | No | Yes |
| Shareable link | Yes | No | No | Yes | No | No |
| Free-tier catch | None — no login or email | Bulk and monitoring are paid | Full platform needs an account | Deeper analysis needs an account | Monitoring needs an account | Emails a generated test inbox |
Common questions
Which free SPF/DMARC checker is best?
It depends on the job: for a quick raw-record lookup most tools work; for a plain-English diagnosis with a shareable report and no login, Relaymetry; for bulk/API workflows, a tool whose row marks those Yes. The table compares them on objective features so you can pick. Once your policy is collecting data, our free DMARC report analyzer reads the aggregate reports your domain receives.
Are these tools really free?
The basic checks compared here are free to run. Some vendors gate advanced features (monitoring, bulk, API) behind paid plans — the table reflects the free tier only.
Do I need to sign up to check a domain?
No — all six run a basic check without a login. The “Free-tier catch” row shows what each one gates behind an account beyond that basic check.