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[Olivier Salaün - CRU <address@concealed>]

If you select the html format ("Edit" > "Account settings" > "Composing and addressing" > "Compose messages in HTML format"), then Thunderbird creates a messages in both text/html and text/plain format both in a multipart/alternative MIME structure.

Barry Flanagan wrote:

Olivier Salaün - CRU wrote:
  

Most Mail User Agents (Thunderbird, Outlook) allow to compose in both
text/plain and text/html, using the multipart/alternative format.
    

This is what I want to do, but I can't see how to create an email in Thunderbird which contains both a text and a html part. I can create either a text OR a html mail, but not one which contains both.

Sorry, but I am a text-only fellow, and not used to sending/using html emails!