Normally nimbus system sends separate emails to the user for every action but if we want to combine these emails in a single email into the inbox, this can be done using the following steps.
Issue/Introduction
Action notifications (Reviews, Authorizations, Promotions) Emails can be combined using this article
Environment
Production And Test Environment
Resolution
Open Action Server Config.ini file in notepad from location TIBCO Nimbus\Action Server In the Email section set CombineEmails to 1 Restart the Email Service