This. With no Content-Type the type gets set to “text/plain” by default – 
should have maybe said this earlier, too

On 17/08/2017, 15:53, "RW" <rwmailli...@googlemail.com> wrote:

    Have you ruled-out the possibility that the mime-type for such parts is
    set to the default mime type of text/plain?



--
Paul Stead
Systems Engineer
Zen Internet

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