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2.1.3.3.6 HTML Text Message Body with Inline Attachments

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When the best body format type is HTML and inline Attachment objects exist, MIME writers SHOULD generate a MIME entity with "multipart/related" for the value of its Content-Type header and two or more child elements, as follows:

  1. The first child entity is a  structure with a MIME content-type of "multipart/alternative", as specified in section 2.1.3.3.4.

  2. Subsequent child entities are generated from the Message object's inline Attachment objects. A child entity MUST be generated if and only if the Attachment object is marked as specified in section 2.1.3.4.1.

MIME writers SHOULD verify that the HTML text actually contains a reference to each inline Attachment object, either by its PidTagAttachContentId property ([MS-OXCMSG] section 2.2.2.29) or its PidTagAttachContentLocation property ([MS-OXCMSG] section 2.2.2.29), as specified in 2.1.3.3.1. If the HTML text contains no such reference, the MIME writer SHOULD<68> consider this Attachment object as not inline and generate its MIME entity as a peer of the MIME entity with a MIME content-type of " multipart/related" instead of as its child.