Limit email address length

How it was found

I can able to add a email address to 255 character or more,as per RFC the maximum length allowed for an email address is 255 characters.

For more info : http://stackoverflow.com/questions/386294/what-is-the-maximum-length-of-a-valid-email-address/574698#574698

related report: https://hackerone.com/reports/28632