Wietse Venema via Postfix-users:
> Michael Tokarev via Postfix-users:
> > Dec 01 18:42:57 isrv postfix/smtp[3009]: < 
> > mailly.debian.org[82.195.75.114]:25: 250-mailly.debian.org Hello 
> > isrv.corpit.ru [86.62.121.231]
> > Dec 01 18:42:57 isrv postfix/smtp[3009]: < 
> > mailly.debian.org[82.195.75.114]:25: 250-SIZE 104857600
> > Dec 01 18:42:57 isrv postfix/smtp[3009]: < 
> > mailly.debian.org[82.195.75.114]:25: 250-8BITMIME
> > Dec 01 18:42:57 isrv postfix/smtp[3009]: < 
> > mailly.debian.org[82.195.75.114]:25: 250-CHUNKING
> > Dec 01 18:42:57 isrv postfix/smtp[3009]: < 
> > mailly.debian.org[82.195.75.114]:25: 250-SMTPUTF8
> > Dec 01 18:42:57 isrv postfix/smtp[3009]: < 
> > mailly.debian.org[82.195.75.114]:25: 250 HELP
> > Dec 01 18:42:57 isrv postfix/smtp[3009]: server features: 0x20100b size 
> > 104857600
> > Dec 01 18:42:57 isrv postfix/smtp[3009]: smtp_stream_setup: maxtime=300 
> > enable_deadline=0 min_data_rate=0
> > Dec 01 18:42:57 isrv postfix/smtp[3009]: > 
> > mailly.debian.org[82.195.75.114]:25: MAIL FROM:<m...@tls.msk.ru> SIZE=586 
> > BODY=8BITMIME
> 
> The remote server announces SMTPUTF8, but Postfix does not request
> SMTPUTF8. It is as if the SMTP client has "smtputf8_enable = no".

The cleanup_out_header() function autodetects that a header needs
SMTPUTF8, including headers added with a header_checks PREPEND
action, but that function is not called for headers that are generated
by Postfix or added with a Milter request, because there was no
need prior to SMTPUTF8.

This is not going to be a one-line fix.

        Wietse
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