Currently in the 'List Conversations' API docs, the 'scope' parameter accepts only the values of 'unread', 'starred' and 'archived', with the default being all non-archived conversations for the user.
However, there is an undocumented feature of the scope of 'sent'. By passing in this value, you are able to retrieve all sent conversations in the user's sent folder. This is a very handy feature as you can possibly be proactive in searching for abusive messages sent between users.
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