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CampaignKit - Email Validation for marketers. Detect invalid and malicious email addresses in your email lists.
Null Bounce - Null Bounce is an email validation tool that helps companies decrease the bounce rate for email campaigns. Also, the service is available as an API, which can be used, for example, on sign-up forms to ensure that user submits a valid email address.
Sender Policy Framework - This is a diagnostic tool that acts as a Sender Policy Framework (SPF) record lookup
Captain Verify - Captain Verify is the best solution to Verify & Clean the validity of your emails.
MailRefine - Decrease Email Bouncing With Best Email Verifier
ListClean - Get rid of invalid, abuse & spam-trap from your email list.