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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