Name Meaning
data The content of the part
subparts ComposeMessagePart
attachment This is of the form "upload://diskfilename", where diskfilename is the one returned by the Upload Attachment method
type MIME multi-part message type
subtype MIME multi-part message sub-type
encoding Type of encoding: 7bit, 8bit/binary, quoted-printable, or base64
filename Filename of the attachment
charset Character set of content
contendid Unique identifier for the part
disposition How information is presented to the user: inline or attachment

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