This article provides information about a change in mailflow detection based on sender ip, sender domain, and recipient domain on Sophos Email Appliances. The following sections are covered:
Applies to the following Sophos products and versions Sophos Email Appliance
Customers should not use "discard" as message action until they are confident they will not loose messages by this change.
Any email coming from a Relay-IP mentioned in "Internal Mail Hosts" was considered an outbound Mail
In addition to the Relay-IP mentioned in "Internal Mail Hosts", the sender and recipient domain is also considered. See the table below.
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