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You can use the Ironport Incoming Relays feature to get around this. Basically you specify how may hops back in the header to look for the ACTUAL sender IP. This works if the number of hops is always going to be consistent.If the hops aren't a co...
We've just implemented an Ironport solution and had *exactly* the same problem.With the assistance of an Ironport engineer, we've moved to using two interfaces per device on different subnets (one inbound, one outbound) and the problems have instantl...