The default value is "no", as expected.

    $ postconf -d smtpd_sasl_auth_enable
    smtpd_sasl_auth_enable = no

Best practice is to enable SASL auth only on the submission ports and
NOT on port 25.

I have changed the setting for submission to:

submission inet n       -       y       -       -       smtpd
#  -o syslog_name=postfix/submission
  -o smtpd_tls_security_level=encrypt
  -o smtpd_sasl_auth_enable=yes
  -o smtpd_tls_auth_only=yes
  -o smtpd_relay_restrictions=permit_sasl_authenticated,reject

Thanks Victor.

regards.
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