----- Message from Wietse Venema via Postfix-users
<[email protected]> ---------
Date: Wed, 30 Sep 2026 08:33:03 -0400 (EDT)
From: Wietse Venema via Postfix-users <[email protected]>
Reply-To: Wietse Venema <[email protected]>
Subject: [pfx] Re: Guidance required on status=bounced (SMTPUTF8 is
required, but was not offered by host y.y.y.y)
To: Postfix users <[email protected]>
anant--- via Postfix-users:
Content-Description: Plaintext Message
We have observed that, some mails are getting bounced due to SMTPUTF8
required.
Mails are initially received on X.X.X.X system for our domain which is
running Postfix 3.5.25 on RHEL 9 OS. They are immediately relayed to
a server Y.Y.Y.Y which is running Postfix 2.10.1 on RHEL 7 OS.
The following is the log extract on server X.X.X.X running Postfix 3.5.25.
Sep 30 13:12:26 X.X.X.X postfix/smtp[80005]: 4hvn7j1FbKz3hn14:
to=<[email protected]>, relay=Y.Y.Y.Y:25, delay=1.4, delays=1.4/0/0/0,
dsn=5.6.7, status=bounced (SMTPUTF8 is required, but was not offered
by host Y.Y.Y.Y)
On server X.X.X.X
postconf smtputf8_enable
smtputf8_enable = yes
On server Y.Y.Y.Y
postconf smtputf8_enable
postconf: warning: smtputf8_enable: unknown parameter
There is no such parameter which can be configured.
As per readings, I am suppose to set ?smtputf8_enable = no.
Do I need to set this to 'NO' on System X.X.X.X running Postfix 3.5.25?
You could disable SMTPUTF8 in master.cf for a specific SMTP client
transport, and route some destinations there with transport_maps:
master.cf:
no-smtputf8 .. .. .. .. .. .. smtp
-o smtputf8_enable=no
Or make it so for all outbound SMTP:
master.cf:
smtp .. .. .. .. .. .. smtp
-o smtputf8_enable=no
But, some sites will reject messages or addresses with SMTPUTF8
content if the Postfix SMTP client does not request SMTPUTF8 in the
MAIL FROM command.
Wietse
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----- End message from Wietse Venema via Postfix-users
<[email protected]> -----
Thank you.
But, currently the issue is for incoming mails for our domain. Within
our setup, while relaying it is getting bounced.
Anant S Athavale
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