On 25-10-2026 15:12, Wietse Venema via Postfix-users wrote:
Danjel Jungersen via Postfix-users:
relay=mail.jungersen.dk[private/dovecot-lmtp], delay=1.8,
delays=1.7/0.07/0.09/0, dsn=5.6.7, status=bounced (SMTPUTF8 is required
, but was not offered by host mail.jungersen.dk[private/dovecot-lmtp])
Perhaps "lmtp -o smtputf8_enable=no" in master.cf can avoid
some of these delivery errors.
What will this trigger?
With smtputf8_enable=yes in main.cf, Postfix will continue receiving
SMTPUTF8 messages.
With "lmtp -o smtputf8_enable=no" in master.cf, the LMTP client
will not require that the LMTP server (Dovecot) announces SMTPUTF8
support.
Then, it is up to Dovecot what happens when a header or envelope
address contains non-ASCII.
Would be good to know if that is an improvement.
Thank you for the explanation!
Since I have Dovecot 2.3.19, which does not seem have utf8 support, I
may run into problems, but I will ask if I can get an utf8 domain to
test with me, and I will get back to you.
//Danjel
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