Dovecot: ssl-params: Generating SSL parameters
What is the message:
dovecot: ssl-params: Generating SSL parameters
inside logs telling me? I did not change anything on server settings.
Solution 1:
From the Dovecot documentation:
When Dovecot starts up for the first time, it generates new 512bit and 1024bit Diffie Hellman parameters and saves them into /var/lib/dovecot/ssl-parameters.ssl. After the initial creation they're by default regenerated every week.
Most likely this is the case.