[1] RFC 5965 - An Extensible Format for Email Feedback Reports (2014-12-21 09:40:25 +09:00 版) http://tools.ietf.org/html/rfc5965

[2] RFC Errata Report (2015-01-30 18:25:13 +09:00 版) http://www.rfc-editor.org/errata_search.php?rfc=5965

[3] RFC 6650 - Creation and Use of Email Feedback Reports: An Applicability Statement for the Abuse Reporting Format (ARF) (2014-11-23 16:28:40 +09:00 版) http://tools.ietf.org/html/rfc6650