I am using web-to-case, where the user submits the application form and it creates a case in my org.(When the case gets created in my org, I have set an workflow rule which sends an auto response mail to user's mail from let's suppose firstname.lastname@example.org)
Now if the user replies to that auto response, it will go to the inbox of email@example.com
Now whatever reply user is sending to firstname.lastname@example.org, it needs to be tracked in activity history of the case generated through web-to-case functionality in the beginning.
Can someone please help me achieve this as I am new to Salesforce.
Thanks in Advance!!