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- From: kehres@ima.com (Tim Kehres)
- Newsgroups: comp.mail.headers,comp.mail.misc
- Subject: Re: Return-Receipt-To & forwarding...
- Message-ID: <290@ima.com>
- Date: 31 Dec 92 00:24:22 GMT
- References: <19921225.001@erik.naggum.no> <sdorner-271292095054@0.0.0.0> <BzxoGE.FIB@iron.hq.aflc.af.mil>
- Followup-To: comp.mail.headers
- Organization: International Messaging Associates, Menlo Park, California
- Lines: 84
-
- In article <BzxoGE.FIB@iron.hq.aflc.af.mil> hanrahan@iron.hq.aflc.af.mil (Kevin Hanrahan) writes:
- >
- > sdorner@qualcomm.com (Steve Dorner) writes:
- >
- > >I think it is high time that some form of standard return receipt were
- > >available in Internet mail. It's one of the few functional areas where the
- > >Internet lags behind practically ever proprietary mail system, and X.400 to
- > >boot.
-
- I could not agree more. Over the past few years, I have attempted within
- the IETF to generate some interest in this, and have been unable to make
- any progress. My position is that there really needs to be two separate
- mechanisms in place - one for UA return receipts, and a delivery
- acknowledgement mechanism that the final delivery agent can use to notify
- the originator that the message has been delivered. In addition, the
- mechanisms need to operate across gateways, hence cannot be tied to any
- particular transport mechanism.
-
- > >My initial leaning is to enshrine "Return-Receipt-To:" as a standard for
- > >successful delivery, since it has some utility and is also not going to go
- > >away anytime soon (rampant fantasies of sendmail haters aside :-)). But I
- > >would also suggest a "Read-Receipt-To:", to be generated by the MUA (and
- > >ONLY the MUA) when the message is actually read.
- > >--
- > >Steve Dorner, Qualcomm, Inc.
- >
- > I would tend to agree with your leaning, but several SMTP compatible
- > mail packages already implement "Return-Receipt-To:" as a read
- > receipt (Control Data's ASCENT*Mail is one of these and is widely
- > used in the U.S. Air Force). I had the pleasure of hacking "elm"
- > to recognize and implement this header for an Air Force customer
- > who demanded this capability and desired compatibility with
- > existing systems.
-
- I would have to disagree with the use of Return-Receipt-To. As the person
- that wrote the code for the return receipt functionality in the LLNL EM
- code (which ASCENT*Mail is derived from), I am somewhat familiar with what
- went into the decision to use Return-Receipt-To. :-) We had a strong desire
- on the part of the Air Force to be able to determine when a message arrived
- at it's destination. Upon further discussions with the client, we found
- that what was really desired was an ability for the sender to know when
- the message was sucessfully delivered to the recipient - in other words
- a devliery report, *not* a return receipt. Unfortunately, we were unable
- to generate our own header fields, so we had the option of using X- fields
- for new functionality or overloading Return-Receipt-To. We chose to do the
- latter, and provide both functions as the result of a single request.
-
- To make this work properly, two things were also done - we first supplied
- our own version of sendmail, with the return receipt code torn out. In
- addition, we had our own local mail delivery program, which was responsible
- for the generation of delivery notifications reports. The later was a major
- win, since very few people seem to be able to tell the difference between
- a sendmail delivery report (what it improperly calls a return receipt), and
- an error message. The new delivery agent, which really is the only agent
- capable of determining the status of final delivery anyway, produced a
- clean, and simple delivery report.
-
- In looking back on what was done, it probably would have been better to
- just define two new X- fields for return receipt and delivery acknowledgement
- use. Sendmail is badly broken when it comes to this stuff, and it is
- impractical to think that we will be able to get good fixes out to many of
- the existing locations. For that reason, if Return-Receipt-To was chosen
- as the basis for either function, it would only add more confusion to end
- users.
-
- > My recommendation on this subject however, would not be to
- > try to formalize the "Return-Receipt-To:" header (or create
- > a Read-Receipt-Header), but instead to attempt to take advantages
- > of MIME, which is now gaining rapid popularity.
-
- Either way, a new header type needs to be defined. I don't really see
- any good reason why return receipt/delivery notification functionality
- needs to be tied to MIME. How am I going to tell users that they can
- only request one of these functions if the other side is running MIME
- compliant UAs and delivery agents? What do we really gain here? We
- certainly lose the ability to use these services in environments and/or
- messages that are 822 compliant but not MIME compliant, which still make
- up the majority of messages in the Internet. If we are to impliment
- smarter delivery agents, it also unnecessarily complicates that code if
- they have to deal with anything more than the 822 header.
-
- Best Regards,
-
- Tim Kehres
-