Re: "Text": "Invalid input value for message part %1" 06.23.2014 03:23 PM
It's saying you don't have a body. In the message list here, it shows no line break between Content-ID: <startpart> and the next line (but there is one in the quoted message). Are you sure you have a good line break between them? It might also be complaining about having a subject when it doesn't have an SMTP recipient.
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