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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