Does HP’s iLO support SNMP polling

One of them is tying up one of my IP's for an I-Lo management page but I do not have any network cabling connected to the I-Lo port on any of these servers.

Are you suuuuuuuuuuuuuuuuuure about that? ILOs don't magically grab IP leases out of thin air with no physical connection. They're cool technology, but they're not voodoo.

How can I find out which machine this is without logging in to the I-lo page?

You should be able to see the MAC address of the network interface that has acquired the lease. From there it should be trivial to look at the MACs of the ILOs in your three servers and see which has a lease. You could also just find the one that someone accidentally plugged in, since they'd have to be plugged in to get a lease.

I do not have credentials because the former admin did not provide them to me unless someone knows a default.

There is usually a sticker on the side of the server that has the ILO's MAC and default user/password. You can also usually reset this by going into the ILO BIOS during boot. These things are outlined in more detail in the manual, you should read it.

Couple things to consider:

1. You can install an SMTP relay on your server and not open it to the world, just firewall the port or even lock it down to 127.0.0.1. So in theory the security of your machine should be moderately compromised at most.

2. Another approach might be to basically replace or supplement the management application with something that does do both SNMP polling and can use SMTP/TLS email service for alerting. So something like this, maybe: http://www.trapreceiver.com/