This has come up so often on Hacker News that I decided to create a very simple JSON API for checking email addresses. Free to use for anyone. Performs the righ

This has come up so often on Hacker News that I decided to create a very simple JSON API for checking email addresses. Free to use for anyone. Performs the right regexp check for email addresses based on RFC-5321 rules (not the oft-quoted but incorrect RFC-822 rules, which are for mail headers), performs MX lookups to ensure mail can be delivered, and performs the same "did you mean" type checks that kicksend's mailcheck performs. I've included both jQuery and server side example code on the site. https://www.emailitin.com/email_validator https://www.emailitin.com/email_validator