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SMTP Proxy With NAT - how to publish Exchange/OWA

colly72

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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  • 0 in reply to EdmundSackbauer

    That's the document I used and I set my rules up exactly the way they describe them. I used AD, instead of LDAP, but I wouldn't think that would make a difference.

    I used Authentication Services to prefetch the credentials and made sure that I could login to the User Portal with the credentials to confirm that they were working.

    So are you using just the publishing rule or did you add a DNAT rule to direct SSL traffic from the External address to your Exchange Server?

  • 0 in reply to HerbStull

    I use just the publishing rule for OWA & EAS, I do not use the reverse Authentication. So there is no need for a DNAT rule, if you use Webserver Protection. See also Rule #2

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