Enabling Postfix SMTPUTF8 support

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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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