How to monitor the number of incoming emails on Ironport via SNMP?

Question

Monitoring

Sometimes it happens that letters stop coming from the outside for whatever reason, they are not as important as the very fact that letters do not arrive, we use Zabbix to monitor the infrastructure, I would like to know how you can use it to get information about the number -ve incoming messages per minute (there is such a command via SSH) ? I googled a lot, but I didn’t get a suitable OID .. (who can tell me about this?