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RFC 2852: The following Proposed Extension to RFC 2852 was compiled at...

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Comment by Thom O'connor
Submitted on 11/5/2003
Related RFC: RFC 2852
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The following Proposed Extension to RFC 2852 was compiled at Sendmail, Inc., in a meeting composed of the following people (in February 2002, but better late than never):Thom O'Connor <thom@sendmail.com>Gregory Shapiro <gshapiro@sendmail.com>Claus Assmann <ca@sendmail.com>Deliver-By:We need DELIVER-BY to control how long a message attempts to be delivered.The current DELIVER-BY RFC 2852 is close to our needs except it lackscontrol over what action to take when the next hop doesn't support theextension.To accommodate this, we intend to extend DELIVER-BY by adding a"by-modifier" to the current syntax as follows: by-value = by-time";"by-mode[by-trace][by-modifier] by-mode = "N" / "R" ; "Notify" or "Return" by-trace = "T" ; "Trace" by-modifier = "U" ; How to treat message when next hop ; doesn't support DELIVER-BY ; U=Ignore actionIf the "U" by-modifier is set and the next hop does not support DELIVER-BY,the sending system passes the message anyway but does not notify the senderof the fact that the message was relayed to a non-DELIVER-BY aware system(effectively ignoring the by-mode). Next Hop ____ Support DELIVER-BY Does Doesn't R R R N N N R+U R I N+U N IIf the next hop supports DELIVER-BY but not our by-modifier extension, theDELIVER-BY information will still be passed and there is a possibility thatan MTA down the line may still send a notification back to the sender asthe by-modifier has been lost.Also, the EHLO response for DELIVER-BY will need to be extended to indicatewhether or not the MTA supports the by-modifier.We also recognize the need for DELIVER-BY to be specified on aper-recipient basis instead of a per-message basis but this is somethingfor a different extension (possibly DELIVER-BY-RECIPIENT).Thanks very much,-thom

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