Question: Is there a tool that verifies email addresses to prevent bounced emails and fake sign-ups?

If you're looking for a service to validate email addresses and cut down on bounced emails and bogus signups, Emailable is a good choice. It offers bulk email list verification, an email verification API and real-time email validation widgets. Emailable guarantees 99% accuracy with its email verification results and integrates with more than 50 common email marketing tools. It also offers an email deliverability check that can boost your email marketing campaign return on investment and overall email health.

Another service worth considering is AtData, which offers more than just email validation. It also offers fraud prevention through metadata, domain information and AI-based risk assessment to help businesses assess who's behind an email address. AtData also offers identity matching for multichannel interactions and data enrichment through demographics and behavioral data to help personalize and engage with customers.

If you're looking for an all-in-one email outreach and verification service, Hunter is a powerful option. It uses proprietary technology and AI to find the most promising leads, extract verified email addresses and verify those addresses to avoid bounces. Hunter integrates with tools like Google Sheets and CRM software and offers a free plan with 25 searches per month, with more expensive plans for larger operations.

Also worth a look is IPQS, a fraud detection service that includes email verification. It offers real-time assessments based on sophisticated algorithms that examine more than 300 data points, so it's a good option for businesses that want to screen out fraudulent transactions and improve email deliverability.