Dovecot and RFC6856

[Tan Mientras]

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-imap-after-upgrade.353908/

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?
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