At 10:13 AM -0700 4/10/07, Mark Sapiro wrote:
>>I believe that all this is documented in the FAQ.
>
> It isn't AFAICT.
I thought it was, but I'll take your word for it.
> I was going to add it, but I am looking for a specific
> RFC reference. I have looked at several RFCs and I don't see anything
> that talks about rewriting domains in headers. All I found was RFC
> 1123 (STD 3), sec 5.2.2 which requires that canonical names, not
> aliases, be used in MAIL and RCPT commands. Can you tell me where to
> look?
RFC 1123 has been superceded. For these things, look at RFC 2821,
section 2.3.5:
2.3.5 Domain
A domain (or domain name) consists of one or more dot-separated
components. These components ("labels" in DNS terminology [22]) are
restricted for SMTP purposes to consist of a sequence of letters,
digits, and hyphens drawn from the ASCII character set [1]. Domain
names are used as names of hosts and of other entities in the domain
name hierarchy. For example, a domain may refer to an alias (label
of a CNAME RR) or the label of Mail eXchanger records to be used to
deliver mail instead of representing a host name. See [22] and
section 5 of this specification.
The domain name, as described in this document and in [22], is the
entire, fully-qualified name (often referred to as an "FQDN"). A
domain name that is not in FQDN form is no more than a local alias.
Local aliases MUST NOT appear in any SMTP transaction.
See also section 3.6:
3.6 Domains
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 A RRs (as discussed in section 5) are
permitted, as are CNAME RRs whose targets can be resolved, in turn,
to MX or A RRs. Local nicknames or unqualified names MUST NOT be
used. There are two exceptions to the rule requiring FQDNs:
- The domain name given in the EHLO command MUST BE either a primary
host name (a domain name that resolves to an A RR) or, if the host
has no name, an address literal as described in section 4.1.1.1.
- The reserved mailbox name "postmaster" may be used in a RCPT
command without domain qualification (see section 4.1.1.3) and
MUST be accepted if so used.
I'm still looking for a specific reference from RFC 2822 that would
be applicable to the case of the "From:" header.
--
Brad Knowles <[EMAIL PROTECTED]>, Consultant & Author
LinkedIn Profile: <http://tinyurl.com/y8kpxu>
Slides from Invited Talks: <http://tinyurl.com/tj6q4>
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