View messages from a user
You can view your private message history with a particular user by following the following steps.
Note: Your private message history will not include messages sent in group private messages.
Click on the name of the user that you want to see your messages with, in the user's list located in the right sidebar.
Upon clicking on the user's name, your view will be narrowed to all of your private messages with the selected user.
You can also view your private message history with a particular user by
entering the search operator
pm-with:(user's email address) in the search