Mailcheck - An application to clean your subscription list from bounces, and enrich data with the customers
TempMail - Temp Mail is the provider of fake and temporary email ID.
mailfloss - Bulk email verification for busy businesses and email marketers. Put your email validation on autopilot. One-time, 60-second setup, no developers needed. Get your emails delivered to real people and maximize your email ROI.
Mailinator - Any Inbox. Any Time.
Reacher - Check if an email exists without sending any email.
10 Minute Mail - Temporary disposable e-mail service to beat spam. Avoid spam with a free secure e-mail address.