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Mimecast DMARC Checker vs MXToolbox: catalog facts
Mimecast DMARC Checker	MXToolbox
Free The record check is free; the full DMARC Analyzer service is a paid Mimecast product.	Freemium Lookups on the site are free to use, with paid plans offered alongside.
Web	Web
Explains every declared and defaulted DMARC tag Makes the enforcement policy easy to read	Many email and DNS checks in one place MX lookups query the authoritative server directly
Protected by Google reCAPTCHA Checks the DMARC record only, not SPF or DKIM	Pages carry prompts for the paid service Each check runs separately rather than as one combined report
Web application	Web application
Closed source	Closed source
License not stated	License not stated
No account needed	No account needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.