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I have done this with Spiceworks, not ServiceNow.
In Spiceworks you can email a dedicated account, it will then process the message and create a ticket. I just had to build the message within AlienVault to match what Spiceworks was looking for. I was able to have it match the inventory within Spiceworks if it was one of our systems and assign the proper ticket level using the risk level from AlienVault.