Is it possible to compose a plain text email in Google Groups?
Clicking on the "New topic" button opens a rich text editor, and I see no option to switch to plain text.
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Sign up to join this communityBy default , it is just plain text, until you change certain formatting options. (or paste in something with rich content, with ctrl+V rather than ctrl+shift+V)
As an owner of a group, you could remove the rich formatting permission from selected members.