[Dovecot] Help required

Hi

I use dovecot on CentOS. It was installed and configured by some other person who doesn't work here anymore. I am trying to renew ssl. But the command works fine and restarts the dovecot. But the license shows the same old expiry. Can you please help me with the same.

When I type in dovecot --version, I get command not found. Please guide me!

Regards,

-- Deepa Malleeswaran