Introducing you to a well-established email verification company from Poland - Bouncer, which has an accuracy of 97%. They accurately identify emails like Gmail, catchall, role-based, and invalid.
Bouncer offers bulk email verification and API email verification services and has been recognized as the best leader in email verification by G2crowd.
The Bouncer is trusted and even used by great companies like SimilarWeb and Phenom.
As they adhere to GDPR compliance and privacy policies, you don't have to worry about security.
To get an idea of how much an email marketing campaign will cost, you can check their ROI calculator (found in their pricing section).
In comparison, Bouncer charges $100 for 50K emails, whereas NeverBounce and BlazeVerify charge $250 and $200 respectively.
As a beginner-friendly and reliable email verification service with satisfactory results, Bouncer is definitely recommendable.