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Mail Tester vs MailGenius: catalog facts
Mail Tester	MailGenius
Free Running a test from the website is free.	Free Free to use.
Web	Web
No setup beyond sending one email to a given address Simple score out of 10 that is easy to read	Checks SPF, DKIM and DMARC together Flags content that may trigger spam filters
Tests a single message rather than ongoing deliverability Little detail on the homepage about what each check covers	Requires sending a message to a third-party service Site uses bot verification before loading
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 September 23, 2026	Official website Full listing and sources Checked October 2, 2026

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