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- Path: sparky!uunet!psinntp!monymsys!sonyd1.Broadcast.Sony.COM!blilly.UUCP!bruce
- From: bruce@blilly.UUCP (Bruce Lilly)
- Subject: Re: Return and read receipts (was Re: Return-Receipt-To & forwarding...)
- References: <1992Dec28.171751.25819@chance.gts.org> <sdorner-281292195409@dorner.slip.uiuc.edu> <1992Dec29.181814.4105@chance.gts.org>
- Organization: Bruce Lilly
- Date: Thu, 31 Dec 92 00:32:23 GMT
- Message-ID: <1992Dec31.003223.22169@blilly.UUCP>
- Reply-To: lilb@sony.compuserve.com (Bruce Lilly)
- Lines: 81
-
- In article <1992Dec29.181814.4105@chance.gts.org> john@chance.gts.org (John R MacMillan) wrote:
- >|> With return-receipt-to, a lack of response means nothing (your message
- >|> may or may not have been delivered), and a positive response means
- >|> there's a good chance your message was delivered, but it's my no means
- >|> foolproof.
- >|
- >|The positive response tells me that there is a path to and from my
- >|addressee.
- >
- >Lack of a bounce message tells you the same thing with about the same
- >reliability ("pretty certain" vs. "fairly sure"). Yes there may be
- >bizarre systems that don't generate bounce messages, but I don't think
- >that's all that common anymore, and it's becoming less so. :-)
-
- Lack of a bounce message tells me nothing useful:
- the message might have been delivered successfully to the
- intended destination
- the message might have been misdirected, and possibly
- delivered somewhere other than the intended
- destination
- the message may have fallen into a bottomless pit at a
- store-and-forward site
- delivery may have failed somewhere with a bounce message,
- but the bounce message may have been misdirected
- or lost or both
- several possible combinations of the above
- the message may be waiting at a store-and-forward site
-
- In summary, I have no positive indication that the message
- was delivered anywhere, and I have no indication that it
- wasn't delivered.
-
- Receiving a bounce message tells me:
- some site somewhere might have failed to pass on the message
- (in fact, it may have forwarded the message)
-
- A return receipt tells me:
- the message was delivered to a specific system (the one that
- sent the receipt), which attempted to perform final
- delivery
- (obviously) the system that sent the return receipt does
- acknowledge return-receipt-to
- the route taken by the original message and by the return
- receipt (via the Received headers)
- the amount of time elapsed between each hop of the original
- message and the return receipt (again via Received
- headers)
- [additional information might be obtained from the return
- receipt's Received headers, including: the MTA
- identity at each hop, the means of transfer between
- MTAs, changes to the envelope address]
-
- In summary, I know a) that the message went somewhere, b) where
- the message went, c) the route the message took, d) how long
- the message took to reach the place to which it went, e) that
- the MTA that sent a return receipt does in fact acknowledge
- return-receipt-to, f) the route taken by the return receipt,
- and g) how long the return receipt took to reach me.
-
- If I have previously established that the MTA for a recipient acknowledges
- return-receipt-to, and I do not receive a return receipt within a reasonable
- time period, I know that something went awry or the MTA was changed.
-
- >| However, if I want some degree of proof that my
- >|question reached Marshall Rose, it's a different story.
- >
- > As "proof" your question reached mtr, a receipt is worthless;
- >it's only an indication. Another indication that your question
- >reached him was that you didn't get a bounce message. I feel that
- >both these indications carry about the same weight. If you get a
- >significantly warmer and fuzzier feeling with the receipt I think
- >you're just fooling yourself.
-
- Isn't ``some degree of proof'' (the original wording, as you can see) the
- same as ``an indication''? In any event, failure to receive a bounce and
- positive receipt of a return receipt clearly mean quite different things;
- see above.
-
- --
- Bruce Lilly blilly!bruce@Broadcast.Sony.COM
- ...uunet!sonyusa!sonyd1!blilly!bruce
-