Delivering time sensitive email including creating an email message for time-sensitive delivery to a multiplicity of addressees' mailboxes on email servers, including inserting in the email message a data element identifying the message as a message for time-sensitive delivery; assigning delivery time constraints to the message; delivering the message, in accordance with the time constraints and for temporary storage outside the mailboxes, to email servers having addressees' mailboxes; and instructing the servers to place the message in all addressees' mailboxes at approximately the same time.