Introduction Introduction. MailTester.Ninja is a free and easy-to-use email checker that verifies or finds any address. Related AI tools Ideal Customers AI 11/07/2024 000 AI Advertising Assistant Type Genius – Chrome Extension 12/09/2024 000 AI Email Assistant Scanlist – Chrome Extension 16/09/2024 000 AI CRM Assistant Zipteams – Chrome Extension 16/09/2024 000 AI CRM Assistant HyperWrite 02/06/2024 000 AI Content Generator Writeseed – Chrome Extension 23/09/2024 000 AI Creative Writing