When message is declared as multipart (declared usign
appropriate headers), that means it contains one or more
parts that are 'separated' from the text of the
message. For example, some mail clients will send formatted
messages so that they send plaintext as regular message
text, and formatted as separate part.
You will notice that message has parts when text is
This is a multi-part message in MIME
which means that actual message is stored in one of
message parts. So, to locate text you are looking for,
instead of looking at
or similar - depending how many parts are in the
message. You can get total number of parts using Count property.