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UTM with hosted email and internal Exchange

Hi Everyone

since many years we are using an internal Exchange Server 2013 and MX record pointing to our public IP address. Our UTM SG210 has the SMTP proxy feature enabled and is receiving and sending emails. Everything is working perfectly!

However, we are planning to use an hosted email provider and then the MX record will point to the provider where all emails will be scanned for viruses, spam, etc. and then forwarded to our exchange server.

I am not really sure how to configure our UTM correctly for this scenario. Do I still need the SMTP proxy feature?

Any help would be greatly appreciated.

Thanks in advance!

Greetings Aktuator

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+1 Niklas Terhorst over 5 years ago

If they forward it you still need / can use it. They will forward it from there mx to your mx

If you have mail boxed from the provider and take the mails for example by using POPcon then u can use the POP3 Proxy from Sophos
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0 Aktuator over 5 years ago in reply to Niklas Terhorst

Thank you Niklas! The hosted email provider will forward the email by using our public IP address.

According to my research I need to add our provider and their servers in "SMTP" => "Relaying" => "Upstream Hosts/Networks". Our UTM will then accept incoming mails only from those servers and will also do Antispam and Malware Scan.

Am I correct or maybe still missing something?

Thanks in advance!

Aktuator
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0 Aktuator over 5 years ago in reply to Aktuator

any further help would be greatly appreciated!
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0 Niklas Terhorst over 5 years ago in reply to Aktuator

Thats correct
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0 Aktuator over 5 years ago in reply to Niklas Terhorst

Thanks! :)
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0 BAlfson over 5 years ago in reply to Aktuator

Normally, inbound emails go to the UTM where they are handled by the SMTP Proxy. The Proxy then forwards the emails to the external server. You might want to consult Basic Exchange setup with SMTP Proxy as it applies to other mail servers, too. Your mail host needs to recognize your UTM as an Upstream Host.

If you want to have outbound emails also handled by the Proxy, your provider will need to designate your UTM's IP as a smart host.

You probably will need to have your email host disable some aspects of anti-spam.

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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