Hi,
I'm happy to announce i've developed a NAGIOS plugIn for MAILENABLE.
It run directly on Mail Enable Box, can also be used localy and can monitor:
1) mailbox % usage (can notify user)
2) monitor queue state
3) monitor traffic, comparing with last week's to find spike
4) check sending IP for blackList presence
5) check # of filter activation occurence
6) check if domain in postoffice have correct MX setting in DNS
7) count # of rejected mail
PM me if interesterd.