Jim Fenton wrote: >> If ADSP can depend on a well-specified requirement for >> checking for the existence of the domain, please indicate >> where this is specified.
The current 2821bis draft says in sec 5: Only resolvable, fully-qualified, domain names (FQDNs) are permitted when domain names are used in SMTP. In other words, names that can be resolved to MX RRs or address (i.e. A or AAAA) RRs (as discussed in Section 5) are permitted, as are CNAME RRs whose targets can be resolved, in turn, to MX or address RRs. Local nicknames or unqualified names MUST NOT be used. The 2822upd draft says in sec 3.4.1: Note: A liberal syntax for the domain portion of addr-spec is given here. However, the domain portion contains addressing information specified by and used in other protocols (e.g., [RFC1034], [RFC1035], [RFC1123], [I-D.klensin-rfc2821bis]). It is therefore incumbent upon implementations to conform to the syntax of addresses for the context in which they are used. and a little later The domain portion identifies the point to which the mail is delivered. In the dot-atom form, this is interpreted as an Internet domain name (either a host name or a mail exchanger name) as described in [RFC1034], [RFC1035] and [RFC1123]. In the domain- literal form, the domain is interpreted as the literal Internet address of the particular host. In both cases, how addressing is used and how messages are transported to a particular host is covered in separate documents such as [I-D.klensin-rfc2821bis]. These mechanisms are outside of the scope of this document. So the intention is clearly that the domains in addresses are supposed to exist, but I don't see it in a MUST sentence. I'll ask whether that's deliberate, or it was so obvious that they didn't think it was worth mentioning. Regards, John Levine, [EMAIL PROTECTED], Primary Perpetrator of "The Internet for Dummies", Information Superhighwayman wanna-be, http://www.johnlevine.com, ex-Mayor "More Wiener schnitzel, please", said Tom, revealingly. _______________________________________________ NOTE WELL: This list operates according to http://mipassoc.org/dkim/ietf-list-rules.html