> The time you spend doing it the right way will reduce your conversion rate because people will view your site as slow. During all those new account registrat

> The time you spend doing it the right way will reduce your conversion rate because people will view your site as slow. During all those new account registrations they're constantly making? Does this feel slow to you? https://www.emailitin.com/email_validator https://www.emailitin.com/email_validator > In this case worse is better. No, it's not. Every time you exclude a valid e-mail address, you lose or annoy a customer for no reason other than your own lack of understanding of the RFCs. There are a number of steps that can be taken that don't involve broken regexps that filter out valid addresses. Please stop trying to justify doing it completely incorrectly.