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- Newsgroups: comp.mail.headers
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!uwm.edu!linac!unixhub!ditka!hico2!sonyd1.broadcast.sony.com!blilly.uucp!bruce
- From: bruce@blilly.uucp (Bruce Lilly)
- Subject: Re: discrepancies between RFC821 and RFC822 (as amended by RFC1123) regarding Received headers
- References: <1993Jan13.214724.14913@broadcast.sony.com> <1j35s2INNp6g@daisy.ee.und.ac.za> <19930118.004@erik.naggum.no>
- Organization: Bruce Lilly
- Date: Wed, 20 Jan 93 23:21:12 GMT
- Message-ID: <1993Jan20.232112.18436@blilly.uucp>
- Reply-To: lilb@sony.compuserve.com (Bruce Lilly)
- Lines: 31
-
- In article <19930118.004@erik.naggum.no>,
- posted to comp.mail.headers,
- Erik Naggum <enag@ifi.uio.no> wrote:
- >
- >Using the "for" clause doesn't require a database of recipients to messages
- >and other expensive solutions because the loop detection information is
- >kept in the message, and it doesn't rely on other sites (which the bogus
- >"count'em, them drop'em" approach does).
-
- Using the for clause properly isn't always easy. You've already alluded to
- the problem with multiple recipients. Even for a single recipient, there are
- potential difficulties.
-
- RFC822 section 4.3.2 says that the "for" clause is used ``to record the
- original [address] specification.'' However, it also (sections 4.1 and 6.1)
- specifies the format, which must be
- local-part @ domain
- Some reformatting of the address may be required if it does not arrive in
- that format (e.g. it may be a source route or it may have come from
- non-SMTP mail). Also, it is not necessarily guaranteed that the (envelope)
- address will be unchanged after traversing a path that carries it through
- several other systems, even if it is indeed a looping message. Comparison
- of the possibly rewritten envelope address to a possibly rewritten version
- of an earlier envelope address might not be meaningful.
-
- If the format restriction were loosened (particularly also if the revised
- specification permitted a list of addressees), it would be easier to use
- this method. Even so, the privacy issue remains a concern.
-
- --
- Bruce Lilly ...uupsi!monymsys!sonyd1!blilly!bruce
-