"503 5.5.1 Error: authentication not enabled" when trying to connect to my postfix server remotley
Solution 1:
For enable SASL when receiving email via smtpd, you need to put this parameter
smtpd_sasl_auth_enable = yes
For enable SASL when sending email via smtp, you need to put this parameter
smtp_sasl_auth_enable = yes
In your postconf output above, you only put smtp_sasl_auth_enable not smtpd_sasl_auth_enable. That's why postfix complain with error
Error: authentication not enabled
Solution 2:
AUTH is not part of basic SMTP, but of ESMTP. So in order to use AUTH, you need to start the SMTP session with EHLO instead of HELO.