So to sum up the comments on the previous submission: 1) Someone did make a fully compliant Regex https://github.com/larb/email_address_validator https://githu

So to sum up the comments on the previous submission: 1) Someone did make a fully compliant Regex https://github.com/larb/email_address_validator https://github.com/larb/email_address_validator 2) Lots of people (including the author http://news.ycombinator.com/item?id=4486264 http://news.ycombinator.com/item?id=4486264) think that you should at least validate that the '@' is somewhere to avoid username / email mixups 3) If your regex fails for foo+tag@something.com lots of people get pissed. I learned you can use that for inbox sorting since foo+tag@something.com goes to foo@something.com. 4) There are other schools of thought that promote validation and telling the user something is wrong like mailcheck.js (https://github.com/Kicksend/mailcheck https://github.com/Kicksend/mailcheck), but these should not stop users from submitting forms. Did I miss anything?