Those email addresses aren't valid although they are still used sometimes. As such Tatsuhiko Miyagawa's Email::Valid::Loose accepts some of them with the following rationale:

Email::Valid::Loose is a subclass of Email::Valid, which allows . (dot) before @ (at-mark). It is invalid in RFC822, but is commonly used in some of mobile phone addresses in Japan (like docomo.ne.jp or jp-t.ne.jp).

--
John.