With IPHost Network Monitor you can run simple snmp requests against a Fortinet device in your network.
fgApIMAPStatsTable
fg Ap IMAP Stats Table
1.3.6.1.4.1.12356.101.10.103.3
A table of IMAP proxy statistics per virtual domain
Back to FORTINET-FORTIGATE-MIB MIB page.
IPHost Network monitor allows you to monitor fgApIMAPStatsTable on Fortinet device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Fortinet access points right now.