Thank you, this solves the issue
Have a nice evening __

Am 13.02.21, 22:12 schrieb "Viktor Dukhovni" <owner-postfix-us...@postfix.org 
im Auftrag von postfix-us...@dukhovni.org>:

    On Sat, Feb 13, 2021 at 09:56:52PM +0100, Dan wrote:

    > It looks like that postfix don't know to handle other users. 

    No, rather you have a syntax error in your main.cf file.

    > Okay how to solve this?

    Fix the syntax error.

    > Here the logs attached.

    > If I send a mail from gmail:
    > 
    > Feb 13 21:44:06 CGSG postfix/smtpd[8296]: warning: unknown smtpd 
restriction: "smtpd_restriction_classes"
    > Feb 13 21:44:06 CGSG postfix/smtpd[8296]: NOQUEUE: reject: RCPT from 
mail-wr1-f49.google.com[209.85.221.49]: 451 4.3.5 Server configuration error; 
from=<da...@gmail.com> to=<da...@domain.com> proto=ESMTP 
helo=<mail-wr1-f49.google.com>

    You have "smtpd_restriction_classes" in the wrong place.

    > 
    >     > /etc/postfix/main.cf:
    >     >     smtpd_recipient_restrictions =
    >     >         ...
    >     >         check_recipient_access 
hash:/etc/postfix/protected_destinations
    >     >         ...the usual stuff...
    >     >  
    >     >     smtpd_restriction_classes = insiders_only
    >     >     insiders_only = check_sender_access hash:/etc/postfix/insiders, 
reject

    There must be leading whitespace in front of "smtpd_restriction_classes", as
    you would see if you use "postconf -nf", rather than just pasting the file
    content.  You can see just the problem settings with:

        # postconf -n | grep smtpd_restriction_classes

    -- 
        Viktor.


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