A computer-implemented method, system, and/or computer program product inserts a new e-mail into an interior of an original e-mail thread. An e-mail server receives a request to send a new e-mail to a new recipient. The new e-mail is relevant to an interior e-mail in an original e-mail thread. The original e-mail thread is an existing e-mail thread that has an unbranched single thread status, and includes an initial e-mail and a latest e-mail that are addressed to prior recipients. The interior e-mail is chronologically between the initial e-mail and the latest e-mail in the original e-mail thread. The e-mail server retrieves the original e-mail thread and inserts the new e-mail into the original e-mail thread next to the interior e-mail to create an updated e-mail thread, such that the updated e-mail thread retains the unbranched single thread status of the original e-mail thread.