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:

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?