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- Newsgroups: comp.mail.headers,comp.mail.misc
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!cs.utexas.edu!torn!newshub.ccs.yorku.ca!yorku.ca!davecb
- From: davecb@nexus.yorku.ca (David Collier-Brown)
- Subject: Re: Return-Receipt-To & forwarding...
- Message-ID: <davecb.725923251@yorku.ca>
- Sender: news@newshub.ccs.yorku.ca (USENET News System)
- Organization: York University
- References: <1i24ofINNaul@gaia.ucs.orst.edu>
- Date: Fri, 1 Jan 1993 21:20:51 GMT
- Lines: 49
-
- In article <davecb.725910818@yorku.ca> davecb@nexus.yorku.ca (David Collier-Brown) writes:
- |>Short answer:
- |> Go read RFC821/2 (and consider yourself insulted).
-
- stanley@skyking.OCE.ORST.EDU (John Stanley) writes:
- |You had better expand on that answer, for neither RFC appears to claim
- |anything opposite to what I wrote. And, since both RFC's deal only with
- |Internet standards, and since electronic mail can cross network
- |boundaries to systems which have no requirement to use SMTP (much less
- |obey Internet RFC's), neither can speak definitively on what I wrote.
-
- |>Long answer:
-
- |> Mail is a reliable, end-to-end service, and must
-
- |Thanks for the laugh. You may think that mail is reliable, but that
- |don't make it so. RFC 822 makes no mention of "reliable", and RFC 821
- |mentions it in two instances, one of which specifies the use of a
- |"reliable transport" mechanism.
-
- Your mail may be unreliable, but mine isn't: mine uses SMTP, which
- defines, as I already pointed out, a positive acknowlegement scheme
- FROM THE SENDING HOST TO THE RECIEVING HOST. If the mail doesn't
- get there, I know about it because I'm doing end-to-end positive handoffs.
- If I'm talking to a proxy (gateway) site, I get a 250 OK from the proxy,
- and at that point it becomes that sites's responsability to do the same
- with any further sites it contacts. If it gets a negative acknowlegement,
- it's its responsability to send me mail saying it didn't get through.
- And that responsability is passed on to each intermediate site in turn.
- Unless you use proprietary PC mailers, your mail uses RFC822 as a
- format standard, and SMTP, BSMTP or UUCP as a transport. SMTP and BSMTP
- do exacly the above, and known UUCP mailers do the same.
-
- And the number of **formally unreliable** mailers can be counted
- on the fingers of a one-fingered man's hand. Alas, he's growing more
- fingers as we speak, due to the existance of erroniously specificed and
- designed PC mail programs.
-
- if skyking.OCE.ORST.EDU is losing mail, you should speak to your
- postmaster: you're on the internet too.
-
-
- --dave (all the world's not a vax, but
- Usenet, BITnet and the Internet ain't trivial) c-b
- --
- David Collier-Brown, | davecb@CCS.YorkU.CA | lethe!dave
- 72 Abitibi Ave., |
- Willowdale, Ontario, | York Postmaster and
- CANADA. 416-223-8968 | occasional sendfail(8) consultant.
-