I'm currently using NAT with our Exchange server (I've not had any success with WAF). I've setup the UTM SMTP proxy to filter inbound and outbound mail, with Exchange using the UTM as a smart host. Any outbound mail is going through the proxy but inbound seems to come straight to the Exchange server, bypassing the smtp proxy. If I turn the NAT rule off, the proxy seems to work properly, but then I can't connect with Outlook, or Outlook Web App. It's probably really straightforward but can anyone give some advice on how I might get this to work? I'd use WAF ideally but I've tried numerous times, following the docs word for word and it never works properly for me. Thanks, Michael
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