Frequently Asked Questions Frequently Asked Questions. MailTester.Ninja is a free and easy-to-use email checker that verifies or finds any address. Related AI tools GoToMarket-AI 19/07/2024 000 AI Advertising Assistant ReelUp 04/08/2025 000 AI Marketing FunBlocks AI – Chrome Extension 29/09/2024 000 AI Content Generator Rings.ai – Chrome Extension 04/09/2024 000 AI Analytics Assistant Dopplio 24/07/2024 000 AI Lead Generation HERA – Chrome Extension 24/09/2024 000 AI Chatbot