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iRedMail - A fully fledged, free email server solution, an open source project (GPL v2).
NeverBounce - Real-time email verification and cleaning to ensure emails never bounce.
Zimbra - Zimbra is trusted by over 500 million users to increase productivity with a complete set of collaboration tools while maintaining total control over security and privacy.
Email List Verify - The Fastest Way to Improve Email List Deliverability and ROI
mailcow - An open source mailserver suite.
clearout.io - Clearout Email Finder & Email Verification Service - Drive sustainable business growth by expanding your reach, lowering hard bounces, and improving deliverability rates.