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Don't know where Dovecot config files are? check this tutorial: Locations of configuration and log files of major components.
To turn on debug mode in Dovecot, please update below parameter in Dovecot
config file dovecot.conf
:
mail_debug = yes
Restart Dovecot service.
If you need authentication and password related debug message, turn on related settings and restart dovecot service.
auth_verbose = yes
auth_debug = yes
auth_debug_passwords = yes
auth_verbose_passwords = yes
If Dovecot service cannot start, please run it manually, it will print the error message on console:
dovecot -c /etc/dovecot/dovecot.conf