Electronic mail messages are tracked for the sender by allowing the sender to flag the electronic mail messages. Flagging the electronic mail messages allows for various notifications to be provided to the sender. For example, notification may be provided to the sender by placing an item in a to-do bar for the sender that corresponds to the electronic mail message. As another example, notification may be provided to the sender by firing a reminder at some future time that corresponds to the electronic mail message. As another example, notification may be provided to the sender by including an indication in a related incoming electronic mail message that the incoming electronic mail message is related to the electronic message sent by the sender.