In a data processing system (100) supporting an electronic mail messaging system, a method of managing e-mail messages comprising, under the control of a mail user agent of a message sender user (QRS): keeping a list (455,450) of messages sent by the message sender user; enabling the sender user selecting (500,505,510) a wrong message (513) from the list of sent messages; causing a correcting message (520) to be sent to at least one of the message recipient users (ABC,DEF,JKL) of the selected message, the correcting message including message qualifier (X-replace-mail) qualifying the correcting message as a message intended to correct the selected message. Under the control of a mail user agent of said at least one of the message recipient users, the correcting message is received; using the message qualifier included therein, the selected message is identified among the received messages (715,720,730), and a correcting action on the selected message is performed.