The Sender Genotype Service is enabled on the Sophos Email Appliance by default. This service uses data from SophosLabs to determine whether the sending IP address has a bad reputation. Messages sent from IP addresses with a bad reputation will be rejected. This feature can help block a large percentage of spam at the connection level based on the reputation of the sender IP address. Not only does this significantly reduce the amount of spam you receive, but also reduces the load on the appliance and your internal mail servers. This article describes how to configure the Sender Genotype Service. The following sections are covered:
Applies to the following Sophos products and versions Sophos Email Appliance
Log in to the Sophos Email Appliance, and select Configuration > Policy > Filtering Options.
Choose one of three options for this setting:
It is important not to disable mail blocking from known bad senders.
Note: If your network has trusted local SMTP relays that pass inbound messages to the Email Appliance, use policy-level blocking instead of connection-level blocking, and add the local inbound SMTP relays to the Trusted Relays list. Connection-level blocking only works correctly if the Email Appliance receives messages directly from the Internet.
Note: When configured in connection-level mode, the appliance performs both a connection-level check and a policy-level check.
It is important to remember that the Sender Genotype Service MUST be scanning the Sender's IP address to be effective and prevent false positives.
The following configuration must be made to ensure we are scanning the Sender's IP address:
Check the reputation of an IP address and request that the IP be re-classified by using our online tool here:
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