> In my opinion, the optimal validation is soft validation: "your email address doesn't look right, continue with it?" And then hope the server's e-mail workfl

> In my opinion, the optimal validation is soft validation: "your email address doesn't look right, continue with it?" And then hope the server's e-mail workflow can handle subaddressing because you entered in something like "username+service@gmail.com". Seems like a lot of folks don't like '+', even though it's been part of the e-mail system since the 1980s.