Enabling Postfix SMTPUTF8 support

Dear all,

I was just confronted with the following bouncing message:

2021-11-04T11:34:34.498941+01:00 its42 postfix/lmtp[20495]: 
6AE063099E9B: to=<server@localhost>, 
relay=host.domain.net[/var/lib/imap/socket/lmtp], delay=0.07, 
delays=0.04/0.01/0.02/0, dsn=5.6.7, status=bounced (SMTPUTF8 is 
required, but was not offered by host 
host.domain.net[/var/lib/imap/socket/lmtp])

So my question is: Is it possible to enable UTF-8 support for Cyrus LMTP 
for email addresses and message header values and how?

Quoting Postfix SMTPUTF8 README 
(http://www.postfix.org/SMTPUTF8_README.html):

/"Enabling Postfix SMTPUTF8 support//
//
//There is more to SMTPUTF8 than just Postfix itself. The rest of your 
email infrastructure also needs to be able to handle UTF-8 email 
addresses and message header values. This includes SMTPUTF8 protocol 
support in SMTP-based content filters (Amavisd), LMTP servers (Dovecot), 
and down-stream SMTP servers. "/

As a work-around I disabled UTF-8 support in postfix by adding: 
'smtputf8_enable = no' in 'main.cf'

Cheers
Roland
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