FIX: The MIME/SMIME decoder in the POP3 adapter selects an incorrect MIME message part in BizTalk Server 2013 or 2016

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Symptoms

When the MIME/SMIME decoder in the POP3 adapter creates a multi-part message in BizTalk Server 2013 R2 or 2016 CU1 from the parts of a MIME-encoded message that it receives, the adapter selects an incorrect message part as the BizTalk message body part.

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Cause

According to the Processing Multi Part Messages with the POP3 Adapter topic on the Microsoft Developer Network (MSDN) website, when the Body Part Index is set to 0 and the Body Part Content Type is blank, the following algorithm is used to select the BizTalk message body part:

Use the first MIME part that has the Content-Description header set to "body"
Otherwise, use the first MIME part that has the Content-Type header set to "text/xml"
Otherwise, use the first MIME part that has the Content-Type header set to "text/plain"
Otherwise, use the first MIME part that has the Content-Type header set to "text/"
Otherwise, use the first MIME part

In this case in BizTalk Server 2013 R2 or 2016 CU1, the MIME/SMIME decoder incorrectly identifies “text/html” as the BizTalk message part.

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