On Tue, Oct 02, 2018 at 15:40:19 +0200,
Stop sending e-mail to public mailing lists using Gmail, then? Or are you going to pay for affected people's bandwith? Mailing lists have push delivery model, so it's not possible to filter-out only HTML e-mail before it's already downloaded.
It is, but it has to be done server side. I think mailman supports dropping html attachments which should work pretty well for multipart/alternative messages. For html only messages you would either need to reject them or rewrite them, both of which have issues.
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