Check for real email addresses at the point of signup AND clean emails you’ve already collected. Email validation API built for developers & CSV bulk email validation for marketers, and anyone really.
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Proofy - Quickly validate and verify your email lists.
MailboxValidator - MailboxValidator - Verify Email Address
Trumail - Free email verification API
ZeroBounce - Removes invalid emails from your list to prevent email bounces from ruining your deliverability.
Email List Verify - The Fastest Way to Improve Email List Deliverability and ROI
NeverBounce - Real-time email verification and cleaning to ensure emails never bounce.