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Network Working Group                                         D. CrockerRequest for Comments: 577                                       UCLA-NMCNIC: 19356                                                  October 1973References:RFC 524, 539, 555                             Mail Priority   InRFC 539 (NIC--17644,3d:gy) Postel and I suggested that mail   senders be allowed to assign a degree of priority to their mail.   White (RFC 555--17993,6c:gy) objected to defining shades of urgency,   without having their effects upon the Mail Protocol server also   defined.   If priority levels were to be assigned by automata, I would agree   with Jim.  Unfortunately, the human sender of the mail will usually   be the one to assign the priority, and humans will not be consistent   in that assignment.   Also unfortunately, the concept of urgency is an integral part of   communication.  If it weren't, we could ignore its inclusion into the   MP.   Since distinctions in urgency are useful (necessary?) and since   humans will be the ones assigning specific degrees of urgency   (thereby making it impossible for server processes to automatically   do the "right thing" in response), we suggested only including the   INFORMATION as part of the protocol.  Let the human and server-   process receivers decide between themselves how the server-process   should deal with that information.   Now that I have argued all that, let me suggest interpretations for   urgency values.  This is so that programmers can have automata-   generated mail (e.g., notification of the status of previously sent   mail) carry reasonable urgency values:      10  Phone in the middle of the night, if necessary.       9       8  Deliver to user's terminal NOW.       7       6  Deliver to user's terminal only if user is at "exec"          level.       5       4  Deliver immediately after sign-on or before sign-off.       3       2  Deliver into standard mailbox.       1       0  Junk MailCrocker                                                         [Page 1]

RFC 577                      Mail Priority                  October 1973         [ This RFC was put into machine readable form for entry ]         [ into the online RFC archives by  Martin Lyngvig 7/99 ]Crocker                                                         [Page 2]