To verify each email, Null Bounce uses several different methods, including SMPT-validation and some provider-specific methods. Role-base, disposable, and free emails are detected as well. All duplicated emails are free.
Here are some features of Null Bounce:
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CampaignKit - Email Validation for marketers. Detect invalid and malicious email addresses in your email lists.
NeverBounce - Real-time email verification and cleaning to ensure emails never bounce.
Sender Policy Framework - This is a diagnostic tool that acts as a Sender Policy Framework (SPF) record lookup
ZeroBounce - Removes invalid emails from your list to prevent email bounces from ruining your deliverability.
MailRefine - Decrease Email Bouncing With Best Email Verifier
Email List Verify - The Fastest Way to Improve Email List Deliverability and ROI