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MailGenius vs Mail Tester: catalog facts
MailGenius	Mail Tester
Free Free to use.	Free Running a test from the website is free.
Web	Web
Checks SPF, DKIM and DMARC together Flags content that may trigger spam filters	No setup beyond sending one email to a given address Simple score out of 10 that is easy to read
Requires sending a message to a third-party service Site uses bot verification before loading	Tests a single message rather than ongoing deliverability Little detail on the homepage about what each check covers
Web application	Web application
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Needs internet	Needs internet
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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