This article provides a comprehensive guide on disabling Prevent, including the necessary steps to modify Microsoft 365 settings, on-premise Microsoft Exchange configurations, and other secure email gateways. Whether you're transitioning to a different email security solution or need to disable Prevent temporarily, this step-by-step guide will walk you through the process, ensuring a smooth and secure transition for your organization's email communications.

You will first need to complete the following steps:

• Disable any Egress mail flow rules within Microsoft 365 and any other secure email gateway.
• Disable the Egress Transport Agent if used in combination with on-premise Microsoft Exchange.
• Remove any Egress send and receive connectors in Microsoft 365 or on-premise Microsoft Exchange.
• Remove any Egress connectors or accepted relays at any other secure email gateway.

If you wish to continue using the Microsoft Outlook add-in without the gateway, you should remove the following registry keys which will have been used to enable gateway mode:

• [HKEY_LOCAL_MACHINE\SOFTWARE\Egress\Switch] "Forcegatewaymode" "Gatewayaddress" "MinimumSizeKB"
• [HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Egress\Switch] "Forcegatewaymode" "Gatewayaddress" "MinimumSizeKB"

If you do not wish to continue using our Outlook add-in, you should also remove this. At the end of your contract, any customized policies, including branding, will be reverted to the default configuration.