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all relevant systems nowadays should be accepting "8-bit" messages. before this change, we would fail delivery for 8bit messages when the remote server doesn't announce the 8bitmime smtp extension. even though that system would likely just accept our message. also, there's a good chance the non-8bitmime-supporting system is some intermediate minimal mail server like openbsd spamd, which was fixed to announce the 8bitmime extension in the past year. in theory, we could rewrite the message to be 7bit-only if it is a mime message. but it's probably not worth the trouble. also see https://cr.yp.to/smtp/8bitmime.html as alternative to PR #287 by mattanja (who also reported the issue on matrix), thanks!