In pre-8.5.2 Domino IMAP environments, and those who have this feature turned off in 8.5.2, mail messages that appear in the Sent, Drafts, and Trash IMAP folders do not stay in sync with the Notes client Sent, Drafts, and Trash views.
The reason for the non sync is, that when an IMAP client Sends, Saves as Draft, or Deletes a mail message, the message is then stored in the special IMAP corresponding Sent, Draft, or Trash folder in the Notes mail database. Or, when a Notes client Sends, Saves as Draft, or Deletes a mail message, that message is stored in the corresponding Sent, Draft, or Trash view.
Since the IMAP client only deposits mail messages in a special IMAP folder and the Notes client only deposits them in views, then a user who uses both an IMAP client and a Notes client will never have these folders and views synchronized.
In Domino 8.5.2 IBM added a option (EnableImapFolderSynch=1) to sync the view and the IMAP Folder (require a notes 8.5.2 mail template).