Copyright 2015-2017 Horde LLC (http://www.horde.org/)
See the enclosed file LICENSE for license information (LGPL). If you did not receive this file, see http://www.horde.org/licenses/lgpl21.
| Horde_Mime_Headers_Extension_Mime | This interface indicates the header is MIME based (RFC 2045 et al.) rather than transport (i.e. RFC 5322) based. |