[BUG] The reason of domino-02.eml is "onhold" at FreeBSD

[azumakuniyuki]

% ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-freebsd10.1]
% ruby -Ilib -rsisimai -e 'print Sisimai.dump($*.shift)' set-of-emails/maildir/bsd/domino-02.eml | jq -M .
[
  {
    "token": "682dea7d06ed50f391095dde6c826bef39921011",
    "lhost": "",
    "rhost": "",
    "alias": "",
    "listid": "",
    "reason": "onhold",
    "action": "",
    "subject": "Nyaaaaaaaaaaan",
    "messageid": "0000000000.00000000-0000000000.00000000-00000000.00000000@example.co.jp",
    "replycode": "",
    "smtpagent": "Domino",
    "softbounce": 0,
    "smtpcommand": "",
    "destination": "example.co.jp",
    "senderdomain": "example.org",
    "feedbacktype": "",
    "diagnosticcode": "???????????? Neko ([email protected]) ??? Domino ????????????????????????????????????????????????",
    "diagnostictype": "",
    "deliverystatus": "5.0.901",
    "timezoneoffset": "+0800",
    "addresser": "[email protected]",
    "recipient": "[email protected]",
    "timestamp": 1341676800
  }
]

The value of reason should be "userunknown", but multibyte characters in the value of "diagnosticcode" might have been converted to "?".