kawaneba.net, aka mutoh, is one of well-known Japanese spammers.
If you are a mail admin, you can safely block all traffic from the
If you are concern anout FP, just reject with 4xx in SMTP session. The
spammer don't care about SMTP reply code, anyway.
| Received: from p2220-ipad68marunouchi.tokyo.ocn.ne.jp
| ([22.214.171.124]:4774 helo=126.96.36.199)
Tomoyuki Sakurai - Tomi -