I receive Discourse messages fine via email (Mail.app, 10.13.4), but when I reply via email, I get an error message:
"We’re sorry, but your email message to [“email@example.com”] (titled Re: [TidBITS] Sending email into Discourse) didn’t work.
None of the destination email addresses are recognized, or the Message-ID header in the email has been modified. Please make sure that you are sending to the correct email address provided by staff."
Am I doing something wrong?