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SenderBase Reputation Filtering is a feature that allows Cisco ESA to reject or throttle connections from email servers based on their reputation score, which is calculated by Talos using sensor information from various sources.

References: User Guide for AsyncOS 15.0 for Cisco Secure Email Gateway, page 6-2.

Configuring the outbound firewall rule to permit traffic on port 3237 is the additional action that resolves the issue. AMP file reputation is a feature that allows Cisco ESA to check files attached to messages against a cloud-based database of known malicious files and apply appropriate actions, such as block, deliver, or quarantine.

By default, AMP file reputation uses TCP port 3237 to communicate with the cloud-based database. If this port is blocked by a firewall, AMP file reputation will not work properly.

To resolve this issue, the administrator can configure the outbound firewall rule to permit traffic on port 3237 from Cisco ESA.

The other options are not valid actions to resolve the issue, because they do not affect the port used by AMP file reputation.

References: [User Guide for AsyncOS 15.0 for Cisco Secure Email Gateway], page 7-5 and page 7-6.

The Outbreak Filters feature uses three tactics to protect your users from outbreaks:

Delay.

Redirect.

Modify.

 in the spam quarantine section, you can configure settings for access to the spam quarantine, and by default, HTTP uses port 82 and HTTPS uses port 83.