[Mimedefang] Problems with append_text_boilerplate

[Gordon Henderson]

Got an odd one here...

If I use append_text_boilerplate, it seems to work, but on messages which
are 100% plain text with no attachments, it adds an extra header - eg:

  Content-Type: multipart/mixed; boundary="----------=_1086193620-5732-0"
  MIME-Version: 1.0

Why is it turning a pure plain-text email into one with attachments? Some
mail clieents are breaking on this and basically discarding the entire
message because they never gind the boundary in the body of the message.

Have I missed something obvious?

Using mimedefang-2.39.

Gordon