I believe that he is right that you should not rely on regexps to validate emails, but I disagree that you should stop it completely. First of all - less incor

I believe that he is right that you should not rely on regexps to validate emails, but I disagree that you should stop it completely. First of all - less incorrect emails sent - less chances to get marked as spam host. Second - it is very easy to catch obvious errors user can do on front end and ask user to correct it. These two is big ones imho