Very excited to be able to use #mutt for my gmail-based work email! (Our admin had disabled "less secure apps," so I needed oauthbearer authentication to be able to use mutt for IMAP access.)
On second thought, Google appears to feel free to clobber message headers if you do this. (For example, "format=flowed" disappears.) Going back to mutt's built-in smtp transport instead.
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