title: jQuery Tag input only allow valid email address
body: <p>There are lots of jQuery Tag plugins for inputs, like jQuery Tag it, TagBox, etc... .</p>
  
  <p>But in my case, I'm gonna get a list of email addresses from the user, so it doesn't need any auto complete etc, but it needs to accept the entries which are valid emails, and separated by comma, so if I type "blabla," the "blabla" is not a valid email address, so it should not considered as a tag. obviously "spaces" are not allowed since there are no spaces in email addresses.</p>
  
  <p>Any easy suggestions for this?</p>
  
  <p>Regards, </p>