The 7 Best Email Verification APIs for Developers

Verifying email addresses is crucial for maintaining low bounce rates and preserving sender reputation, as fake or mistyped addresses can infiltrate lists through various means. Email verification APIs, such as Emailable, ZeroBounce, NeverBounce, Kickbox, BriteVerify, Bouncer, and Mails.so, offer solutions by validating syntax, checking MX records, and verifying SMTP servers to ensure deliverability. Each API has unique features, such as data enrichment, integrations, and compliance with standards like GDPR, and caters to different needs, from hobbyists to large enterprises. While verification APIs can significantly improve email list hygiene, they are not infallible and should be used alongside other measures like CAPTCHAs and double opt-in emails to enhance accuracy and engagement rates. Resend, an email platform for developers, provides various tools and expert support to optimize email deliverability and recommends a combination of verification and additional methods for best results.