(per RFC6522)

Type name:  text

Subtype name:  rfc822-headers

Required parameters:  None

Optional parameters:  None

Encoding considerations:  7-bit is sufficient for normal mail
   headers, however, if the headers are broken or extended and
   require encoding to make them legal 7-bit content, they MAY be
   encoded with quoted-printable as defined in [MIME].

Security considerations:  See Section 7 of [RFC6522].

Interoperability considerations:  none

Published specification:  [RFC6522]

Applications that use this media type:  Mail Transfer Agents, Mail
   User Agents, spam detection and reporting modules, virus detection
   modules, and message authentication modules.

Additional information:

   Magic number(s):  N/A

   File extension(s):  N/A

   Macintosh file type code(s):  N/A

Person and email address to contact for further information:  Murray
   S. Kucherawy <msk&cloudmark.com>

Intended usage:  common

Restrictions on usage:  none

Author:  Murray S. Kucherawy <msk&cloudmark.com>

Change controller:  IESG