No, the mail server is configured to log at “debug” level.
What is happening is the following:
- the dovecot instance in your organization has been configured to log at the debug level. The debug level is meant for advanced troubleshooting and requires deep insight into the workings of the dovecot software. Since there is no problem, there is no need for troubleshooting, and since there is no need for troubleshooting the log level can be set to a lower (less verbose) level.
- Your security staff in your center complains that they do not understand the logs. This is because understanding these logs requires deep insight into the workings of the dovecot software, which they don’t have.
Hence the solution: the staff running the dovecot software should change the log level.
This is not something they should complain about to the people using the dovecot software (i.e. you). It is something they or their staff colleagues did.