I've been researching email verification methods for a business application, and I'm trying to understand how developers reliably determine whether an email address is valid without actually sending a message. I know basic syntax checks and DNS MX record lookups are relatively straightforward, but verifying mailbox availability seems more complicated, especially with catch-all domains and providers that restrict SMTP checks. Has anyone integrated an email verification API into a CRM or registration workflow? How accurate are these services in practice, and what techniques help reduce false positives? I'd also be interested in recommendations for handling large lists efficiently.
I've been using https://envoapi.com/ for email verification in my registration flows and it handles catch-all detection and disposable address checks well. Their API integrates easily and gives live results, which cuts down false positives. For large lists, batch processing works fine without timeouts, so you can run everything in one go.
