[Dovecot] Tools to analyze status/stats?

Hello,

I recently installed dovecot on a server running Debian.

I only have 10 users, but we probably have 6Gig of email between us.

Things were working flawlessly for a couple of weeks, and I'm still getting email, but the last few days we are getting fewer emails that we typically do. So although things seem to be working well, everyone is suspicious something is wrong due to the lack of email volume.

Is there a size limit that dovecot can manage? Are there any admin tools to get status messages for dovecot? Are there any reporting tools to show how many messages are processed/managed by dovecot?

Thanks!!