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Proofy - Quickly validate and verify your email lists.
GMass - GMass allows you to easily schedule emails, send out mass emails and mail merge campaigns and more with Gmail! Click here to learn about more features!
Trumail - Free email verification API
Elevatr Email Marketing Automation - Fast and easy email marketing software
Email List Verify - The Fastest Way to Improve Email List Deliverability and ROI
Google Sheets Email Marketing - Email automation and validations directly from Google Sheets