Functionality can be implemented in email applications to allow sent messages to be updated, even if the sent messages have been read. When a request to update a sent message is received, a message update unit can update information in the message according to the notification. The message update unit can notify a recipient that the message was updated, and can indicate changed information in the sent message. The message update unit can also determine if the sent message has been forwarded, and forward the update notification to other recipients.