Archiving - Proofpoint - SMTP Relay Configuration

Overview 

This guide provides an overview of the configuration settings required in Proofpoint for enabling the outbound SMTP relay feature. The outbound SMTP relay feature is used for compliance archives that require submission over SMTP.

Prerequisites 

This guide applies to customers using the following Proofpoint Email Protection products: 

• Proofpoint Essentials

TLDR

1. Add Nuclei IP Addresses to Sending Servers list (outbound SMTP relay feature)
2. Add Nuclei IP Addresses to Safe Sender List
3. Add Nuclei IP Addresses to Non-Throttled Hosts 

Getting Setup

Enable the outbound relay feature

Review the configuration requirements outlined in the following help center article: 

Proofpoint Essentials - Email Security - Administrator Topics - Enabling Outbound Relay Feature

Ensure that Nuclei's IP addresses have been added to the list of Sending Servers.

Add Nuclei IP Addresses to Safe Sender List

Review the configuration requirements outlined in the following help center article:

Proofpoint Essentials - Email Security - Administrator Topics - Setting up Sender Lists

Ensure that Nuclei's IP addresses have been added to the Safe Sender List.

Add Nuclei's IP Addresses to Non-Throttled Hosts

1. From your Proofpoint admin center, navigate to Email Firewall, then SMTP Rate Control.
2. Select "Non-throttled hosts"
3. Create a new, separate rule for each of Nuclei's IP addresses
   1. Type: Sender IP Address
   2. Condition: Equals
   3. Value: {IP Address}

More Information

For support completing the Proofpoint SMTP relay configuration please contact Nuclei's support team at support@nuclei.ai. 

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