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- Newsgroups: comp.protocols.iso
- Path: sparky!uunet!usc!wupost!gumby!yale!yale.edu!ira.uka.de!math.fu-berlin.de!informatik.tu-muenchen.de!LRZnews!cd1.lrz-muenchen.de!a2824as
- From: a2824as@cd1.lrz-muenchen.de (Michael Storz)
- Subject: Re: OSI == second system syndrome
- Message-ID: <1992Sep2.183834.5036@news.lrz-muenchen.de>
- Sender: news@news.lrz-muenchen.de (Mr. News)
- Reply-To: Michael.Storz@lrz.lrz-muenchen.dbp.de
- Organization: Leibniz-Rechenzentrum Muenchen, Germany
- References: <BtMtov.9xK@immd4.informatik.uni-erlangen.de> <id.ZIRS.GD@ferranti.com> <1992Aug31.140004.4374@news.lrz-muenchen.de> <id.TPVS._L3@ferranti.com>
- Date: Wed, 2 Sep 1992 18:38:34 GMT
- Lines: 90
-
- In article <id.TPVS._L3@ferranti.com>, peter@ferranti.com (peter da silva) writes:
- |> In article <1992Aug31.140004.4374@news.lrz-muenchen.de> Michael.Storz@lrz.lrz-muenchen.dbp.de writes:
- |> > In article <id.ZIRS.GD@ferranti.com>, peter@ferranti.com (peter da silva) writes:
- |> > |> As X.400 gets more common, I'm getting more and more bounces. Worse, I'm
- |> > |> getting bounces from replies to messages originated in X.400 land, where
- |> > |> the gateway didn't put an unambiguous address in the sender field. Because
- |> > |> there is no such thing as an unambiguous address in X.400.
- |>
- |> > Sorry, I do not understand these sentences, the information in them seem to be
- |> > very strange to me.
- |>
- |> > 1) Why should the gateway put an address in the sender field?
- |>
- |> So that the recipient can reply to the message. It has to put *something*
- |> from the X.400 sender address in the RFC822 From line.
- |>
- |> > 2) What do you mean with unambiguous address?
- |>
- |> I mean I'll get mail from "Joe.Blow@foo.bar.something.something" and when I
- |> reply to it I get a bounce from the X.400 gatweway telling me there are half
- |> a dozen Joe Blows at foo.bar.
- |>
- |> > 3) Why do you think that X.400 does not know such thing like an unambiguous
- |> > address?
- |>
- |> An X.400 address is more like a pattern. It specifies search criteria in
- |> greater and greater detail, but there seems to be no fixed subset of an
- |> address that uniquely specifies a recipient.
- |>
- |> > 4) What are you doing with an address of the sender field in a reply?
- |>
- |> I'm putting it in my "To" field.
-
- Ah, now I know why I was so confused by your first sentences. You were talking
- about 'sender field' and I thought you meant the RFC 822 sender field, but you
- were talking about the RFC 822 From field. Sorry for this misunderstanding.
-
- 1) Your statement 'there is no such thing as an unambiguous address in X.400' is
- wrong. X.400(88) 12.4 O/R address states:
-
- An O/R address contains information that enables MHS to uniquely identify
- a user to deliver a message or return a notification to him.
-
- Maybe you are confused by the flexibility of X.400 O/R addresses because
- there are several different forms:
-
- - Mnemonic: Provides a user-friendly means of identifying users in the
- absence of a directory.
- - Terminal: Provides a means of identifying users with terminals
- belonging to various networks.
- - Numeric: Provides a means of identifying users by means of numeric
- keypads.
- - Postal: Provides a means of identifying originators and recipients
- of physical messages.
-
- 2) If the gateway didn't put an unambiguous address in the RFC 822 From field,
- then it is not conforming to RFC 1327 or to one of the predecessors RFC 987
- or 1148. I suppose this could be the case with some commercial gateways.
- These RFCs specify exactly how to map the fields From, Sender, Reply-To from
- RFC 822 to X.400 and back.
-
- If you get bounces for replies to messages originated from X.400, you should
- really complain that to the provider of the gateway and if that doesn't help
- make this information available to the net. This would help to make such
- gateways more reliable.
-
- BTW I am responsible for such a gateway, where several thousand mails per month
- are mapped from SMTP to X.400 and back and have never experienced such a case.
- Mails only bounced when the user keyed in an address manually or when an
- intermediate SMTP system changed an address.
-
- Regards
-
- Michael Storz
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