I have not been able to get the "Recent msg only" option of the IMAP test working on HostMonitor version 3.19. The return value is always the total number of messages in my inbox, not just the number of messages added since it was last checked.
We have tested HostMonitor with several IMAP servers, it works correctly. Probably something wrong with your IMAP server? Do you have checked "Recent msg only" option in the Test Properties dialog?
I have the "Recent msg only" checkbox selected. I checked with our system administrator. We are running Microsoft Exchange Server 2000. IMAP4 protocol is active. I don't know what the problem could be.