Hi.

Just after upgrading *courier* from an old version, we are receiving warning messages instead of mails stating: "This E-mail message was determined to be Unicode-formatted but your E-mail reader does not support Unicode E-mail." warnings. It looks much like:

*https://bugzilla.mozilla.org/show_bug.cgi?id=1571672 https://bugzilla.mozilla.org/show_bug.cgi?id=1571672* https://talk.plesk.com/threads/messages-with-unicode-unable-to-pick-up-via-i...

it seems, malformed mails (they showed errors before migration, but they were shown at least!) are handled incorrectly by thunderbird and the only option is to *revert backwards or migrate to dovecot*.

*Does dovecot also implement RFC8656*? Will the same happen if we migrate to dovecot? Any plans for future adoption of that RFC?