withdrawing mails

[sl at van-bc.UUCP]

In article <2420 at mtgzy.UUCP> ecl at mtgzy.UUCP writes:
>In article <3144 at osu-eddie.UUCP>, lien at osu-eddie.UUCP writes:
>> This is the point that US mail beat E-mail:
>> 
>> One can alway withdraw a mail from one's own mailbox before
>> mailman comes. This is usually one  night and one  morning
>> ( may be one long weekend ).
>
>True, but this is analagous to composing a file to send and then setting up
>an 'at' or a 'cron' job to mail it.  Once you drop a letter in a post office
>drop box (like on a street corner) you *can't* get it back without all sorts of
>legal hassle, etc.
>
>					Evelyn C. Leeper
>					(201) 957-2070
>				UUCP:	ihnp4!mtgzy!ecl
>				ARPA:	mtgzy!ecl at rutgers.rutgers.edu


In point of fact the CCITT X.400 has almost precisely this capability. If
you send a deferred delivery message you can attempt to cancel it.

	X.400 4.1.2.8 Defferred delivery cancellation
		This service element aenables an originating UA to instruct the MTS
	to cancel a previously successfully submitted deferred delivery message.
	The canellation attmpt may not always succeed. Possible reasons for 
	failure are: deferred delivery time has passed, or the message has
	already been forwarded within the MTS.

		(UA - User Agent, MTS - Message Transfer System)

There is no equivalent capability for messages submitted for immediate
delivery.





-- 
Stuart Lynne	ihnp4!alberta!ubc-vision!van-bc!sl     Vancouver,BC,604-937-7532
Todays selection: Perry Mason solves The Case of the Careless Kitten, Erle
Stanley Gardner, 1942. The ingredients for murder were: A poisoned kitten; a
misssing uncle; a slow-speaking gardener; a prospective bridegrooms accident!