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Exchange 2010 Setup - Public IP

I have an internal Exchange 2010 server, behind a newly installed UTM.  My DNS records have a public IP address configured for my Exchange server (an A record and an MX record).

until purchasing the UTM, we had a Sophos Email ES1100 appliance, which we setup with another MX record (with lower priority) and A record.  All email would therefore go through the Email appliance and was then passed on to the Exchange Server

This setup has served us well but what is best practice for the UTM?  How should I configure my DNS in this scenario?

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0 vilic over 10 years ago

A and MX records should point to UTM WAN interface. UTM should be configured to route to your internal Exchange by static host list or internal DNS hostname.
In SMTP -> Relay add your Exchange server to Allowed hosts.
In SMTP -> Advanced configure SMTP hostname same as your public A record.
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0 BAlfson over 10 years ago

Hi, colly72, and welcome to the User BB!

Exchange with SMTP Proxy is a post I started four years ago and continue to update with suggestions from others here.

Cheers - Bob

Sophos UTM Community Moderator
Sophos Certified Architect - UTM
Sophos Certified Engineer - XG
Gold Solution Partner since 2005

MediaSoft, Inc. USA
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