Gmass

Just paste in your mailing list and our email verification tool will run validation on each address. We’ll check each one and let you know if an email is validated or invalid (because it was blocked, the mailbox was full, and so on).

. Send email campaigns inside Gmail. Gmass focuses on clarity and ease of use, so setup is quick and teams can iterate without heavy training. You get practical controls, sensible defaults, and reporting that highlights what matters, making it easier to scale confidently. It balances power with simplicity, helping you deliver results faster while keeping processes reliable.