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nsIMsgHdr
nsIMsgHdr - this interface describes headers for all mail messages. It can be used to retrieve address, subject and related header information for a mail message.
nsIMsgDBHdr
nsIMsgDBHdr - this interface describes headers for mail messages. It is a child of nsIMsgHdr (see above).
nsIMsgThread
nsIMsgThread - this interface is used to interact with threads in Thunderbird.
nsIMsgDBView
nsIMsgDBView - The nsIMsgDBView interface handles the display of mail in the threadpane and preview pane of Thunderbird and other XPCOM based mail cients.