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- Path: sparky!uunet!noc.near.net!news.bbn.com!drilex!dricejb
- From: dricejb@drilex.dri.mgh.com (Craig Jackson)
- Newsgroups: comp.mail.headers
- Subject: Re: Return-Receipt-To & forwarding...
- Date: 3 Jan 93 00:43:40 GMT
- Organization: DRI/McGraw-Hill, Lexington, MA
- Lines: 51
- Message-ID: <51785@drilex.dri.mgh.com>
- References: <19921225.001@erik.naggum.no> <sdorner-271292095054@0.0.0.0> <davecb.725771350@yorku.ca> <1hv93pINNc85@gaia.ucs.orst.edu> <davecb.725910818@yorku.ca>
- NNTP-Posting-Host: bbn.com
-
- Here are some of my thoughts on this subject:
-
- 1. I consider the lack of a good receipt system to be a major limitation
- to internet (small i) mail.
-
- 2. In snail mail, the intent of receipts is not to report that the mail
- has actually been read by the intended human and comprehended.
- It is instead an indication that the recipient or the
- recipient's authorized and identified agent has been made
- aware of the message, and therefore the intended recipient *should have*
- read it (or otherwise dealt with it).
-
- In other words, these receipts say "We delivered this message at such-and-such
- time, and so-and-so at the proper address signed for it,
- so it isn't our fault if the intended recipient hasn't read it" or
- "We delivered your mail to the proper address at such-and-such time, but
- so-and-so refused it" or possibly "We tried to deliver your mail, but no one
- could be found to accept or refuse it".
-
- 3. Most proprietary Email systems have a receipt system, with similar semantics
- to the snail-mail receipts. They also generally maintain more control
- over the mail before final display than the average UNIX mail implementation,
- so the receipts are fairly reliable.
-
- 4. The invasion of privacy of receipts is frequently mentioned. However,
- under the definition of (2) above, then the purpose of the receipt request is
- to absolve the delivery system of responsibility and to place the onus
- on the recipient.
-
- By analogy, if an Email UA offers the opportunity for the recipient to
- refuse to send the receipt back, it should also refuse to show the mail
- to the recipient, and a delivery-refused indication should be returned.
-
- 5. Not all internet mail is handled in a single interactive SMTP hop.
- Even Internet mail can still go through several hops via the deprecated-
- but-not-eliminated mechanism of source routing, and via the tacitly-approved
- "%" hack. Therefore, presence or absence of certain SMTP indications
- does not necessarily indicate delivery to the final mail store, let alone
- having been presented to the intended recipient.
-
- 6. Two other notes of the snail-mail analog:
-
- a. One aspect of a snail-mail receipt is a signature. A truly accurate
- Email model would require a digital signature system.
-
- b. Snail-mail receipts are nearly always extra-cost items. I don't know
- of any mechanism for modelling this in the internet environment.
- --
- Craig Jackson -- cjackson@mgh.com (Straight Internet)
- dricejb@drilex.dri.mgh.com (uucp-forwarded)
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