For some reason, which I haven't bothered to look into yet, some of the Trend EHS servers were on the IP Blocklist of one of our customers.
Unfortunately the consultant we took over from hadn't specifically configured the IP ranges in the IP Allow lists. This meant that some mail was being rejected, after it had been through and scrubbed by the clients own Trend EHS subscription.
The IP ranges to whitelist are here - EHS Outbound Server Lists
As an aside, we setup the Trend MX record additionally to the clients own, then setup the Exchange connectors to only accept mail from the above list of IP's. This permits switching from the Trend Services back and forth from the clients mail server much easier.
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