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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ZeroBounce - Removes invalid emails from your list to prevent email bounces from ruining your deliverability.
NeverBounce - Real-time email verification and cleaning to ensure emails never bounce.
Email Checker - Email Checker offers a real-time API and bulk validation for list cleaning.
Bulk Email Checker - Bulk Email Checker is an online service used to Verify and Clean Email Addresses. Its Easy to Use, Reliable and used by 1000's of Businesses.
Email List Verify - The Fastest Way to Improve Email List Deliverability and ROI
Email Hippo - Email Hippo provides online email validation service for professional marketers and their clients.