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Mail Relay for one customer on a different IP as for the rest of the SMTP traffic

AlexanderPoettinger

Status:

  • Sophos UTM cluster with two WAN interfaces/IP-networks
  • Mail protection in use for all email traffic
  • Outgoing SMTP traffic on the primary address of the 1st WAN interface
  • Customer's MX record points to above IP address and is processed by Exchange server in LAN

Requirement:

  • Customer wants to send great amount of automatically generated report emails
  • To avoid emails going through the Exchange server, the customer's program will connect to Sophos UTM SMTP Proxy from WAN with Username/Password.
  • We want to avoid to have our primary SMTP IP blacklisted if customer's emails cause trouble

Question:

  • Is there a way to have only this email stream leave the UTM from a different IP address/interface than our 1st WAN's primary IP?

 



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    You need to bypass the SMTP Proxy so that the traffic flows out with DNAT.  If your source server does not do mail routing, and you don't want to use an Exchange send connector, you can download a copy of SmarterMail from SmarterTools.com, and use it as a mail relay.

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  • 0

    You need to bypass the SMTP Proxy so that the traffic flows out with DNAT.  If your source server does not do mail routing, and you don't want to use an Exchange send connector, you can download a copy of SmarterMail from SmarterTools.com, and use it as a mail relay.

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