With IPHost Network Monitor you can run simple snmp requests against a Fortinet device in your network.
fgApPOP3StatsEntry
fg Ap POP3 Stats Entry
1.3.6.1.4.1.12356.101.10.102.3.1
Proxy pop3 statistics for a particular virtual domain
Back to FORTINET-FORTIGATE-MIB MIB page.
IPHost Network monitor allows you to monitor fgApPOP3StatsEntry on Fortinet device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Fortinet WAN extenders right now.