We have been troubleshooting some SPX issues in 9.309 and Sophos support recommended turning on transparent mode. After doing so, we quickly found out that mail stopped routing out through our IP address dedicated to SMTP traffic. Instead, mail began to flow through the primary WAN address of the Sophos, which was blacklisted. It seems turning on transparent mode causes the Sophos to disregard where the mail came from and not use our SNAT that was routing mail through our SMTP IP.
Is this by design, or is there a workaround to force the Sophos to send SMTP traffic out a specific IP with transparent mode enabled?
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