Just to clarify, does this error mean they requested SASL login and postfix told them it wasn't enabled? I am under the belief SASL logins are disabled on port 25. (smtpd_sasl_auth_enable = no) Or does it mean postfix allowed them to provide login details and it failed because of bad user/pass? I just want to verify its not enabled, because they repeatedly did this like a dictionary brute force attempt.
postfix/smtpd[1940626]: connect from unknown[5.34.207.103] postfix/smtpd[1940626]: warning: unknown[5.34.207.103]: SASL LOGIN authentication failed: UGFzc3dvcmQ6 postfix/smtpd[1940626]: disconnect from unknown[5.34.207.103] ehlo=1 auth=0/1 rset=1 quit=1 commands=3/4
