I have created a docker image based on Ubuntu 20.04 with postfix and dovecot. I also installed syslog-ng in hope to solve my problem, but it didn't work.
Thing is, I want to use fail2ban to prevent force brute attacks, and I need postfix/smtp/sasl logs. I configured postfix to log to a file adding maillog_file = /var/log/postfix.log to main.cf. It does creates a postfix.log file, but no information is logged om smtp/sasl authentication.
These messages are not shown on messages, syslog or mail.log files, which have almost no data.
Any tips on how to achieve complete authentication logging for postfix so that fail2ban can catch it?
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