>For the record, the gold standard for email validation is "send a confirmation link and see if they click it". Don't try and get fancy. But make sure you have

>For the record, the gold standard for email validation is "send a confirmation link and see if they click it". Don't try and get fancy. But make sure you have some sort of rate limiting set up, so malicious users can't take advantage to spam someone's mailbox (and get your server blacklisted).