EmailThread
Email Threads are a collection of Email activities belonging to the same thread.
List or filter all EmailThread activities.
GET /activity/emailthread/{?lead_id, user_id, date_created__gt, date_created__lt}
You'll get one object per email conversation (generally grouped by subject).
Fetch a single EmailThread activity.
GET /activity/emailthread/{id}/
Delete an EmailThread activity.
DELETE /activity/emailthread/{id}/
This will also delete all the email activities belonging to this thread.