If you configured service email rules in Pega Platform 7.3 or earlier, following an upgrade, you must add required fields in order for your applications to reply to Pulse email notifications correctly.
For complete details on configuring Pulse email notifications, see Configuring Pulse email notifications.
Open the Records Explorer to search for the service email rule that you created to configure replies to Pulse email notifications.
Expand the Integration-Services category and click Service Email.
Click the service email rule that you created for Pulse email replies.
In the Message header section on the Request tab of the service email, add the following fields:
Field name Description Map to Map to key Message-ID Message-ID Clipboard .pyInboundEmail.pyMessageID In-Reply-To In-Reply-To Clipboard .pyInboundEmail.pyInReplyTo References References Clipboard .pyInboundEmail.pyReferences
Save the Service Email rule.
Restart the email listener that is configured with the service email rule.