Very interesting information.I would like to recommend Zerobounce.net . I had good accuracy for detecting spam traps, invalid, do not mail, catch-all and abuse emails at competitive prices. The API is available for real-time validation and comes in different wrappers like Java, PHP, C# and others. Now with full GDPR compliance they have a strict privacy policy that ensures no data is shared with any entities.
Best regards!
GeorgeIonita
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