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- Newsgroups: comp.mail.headers
- Path: sparky!uunet!cs.utexas.edu!sdd.hp.com!mips!mips!munnari.oz.au!comp.vuw.ac.nz!asjl
- From: Andy.Linton@comp.vuw.ac.nz (Andy Linton)
- Subject: Re: can an @domain be numeric?
- Nntp-Posting-Host: bats.comp.vuw.ac.nz
- Message-ID: <BtDKBo.n42@comp.vuw.ac.nz>
- Organization: Dept. of Comp. Sci., Victoria Uni. of Wellington, New Zealand.
- Sender: news@comp.vuw.ac.nz (News Admin)
- References: <9208211741.AA28843@cognition.pa.dec.com>
- Date: Sat, 22 Aug 1992 07:47:47 GMT
- Lines: 49
-
- In article <9208211741.AA28843@cognition.pa.dec.com> vixie@PA.dec.com (Paul A Vixie) writes:
- >rfc822 implies "yes". many IBM/VM/SMTP mailers seem to say "no" in that
- >if they see
- >
- > From: user@10.977.enet.dec.com
- >
- >they yell about the "1" following the "@".
-
- It seems pretty clear to me that this address is 100%. RFC 1123 has
- this to say - the emphasis is not mine, it comes straight from the RFC
- text.
-
- 2.1 Host Names and Numbers
-
- The syntax of a legal Internet host name was specified in RFC-952
- [DNS:4]. One aspect of host name syntax is hereby changed: the
- restriction on the first character is relaxed to allow either a
- letter or a digit. Host software MUST support this more liberal
- syntax.
-
- Host software MUST handle host names of up to 63 characters and
- SHOULD handle host names of up to 255 characters.
-
- Whenever a user inputs the identity of an Internet host, it SHOULD
- be possible to enter either (1) a host domain name or (2) an IP
- address in dotted-decimal ("#.#.#.#") form. The host SHOULD check
- the string syntactically for a dotted-decimal number before
- looking it up in the Domain Name System.
-
- DISCUSSION:
- This last requirement is not intended to specify the complete
- syntactic form for entering a dotted-decimal host number;
- that is considered to be a user-interface issue. For
- example, a dotted-decimal number must be enclosed within
- "[ ]" brackets for SMTP mail (see Section 5.2.17). This
- notation could be made universal within a host system,
- simplifying the syntactic checking for a dotted-decimal
- number.
-
- If a dotted-decimal number can be entered without such
- identifying delimiters, then a full syntactic check must be
- made, because a segment of a host domain name is now allowed
- to begin with a digit and could legally be entirely numeric
- (see Section 6.1.2.4). However, a valid host name can never
- have the dotted-decimal form #.#.#.#, since at least the
- highest-level component label will be alphabetic.
-
-
-
-