Enable Outbound Messages
|Knowledge Article Number||000221208|
|Description||Available in: Enterprise Edition; Performance (AKA - Unlimited) Edition; Developer Edition
How Outbound Message Notification becomes available on Setup menu?
In order to have the option to configure the Outbound Message Notification under the SetUp menu, request to Enable dead letter queue for outbound messaging for the org.
Contact Salesforce support with the following information to enable the feature;