On Sunday 19 October 2003 04:31, Meng Weng Wong wrote:
If people really feel strongly about not using an _smtp_client
subdomain, this is one alternative. What do people feel about
this?
On Mon, Oct 20, 2003 at 05:44:15AM +0100, Phil White wrote:
Totallly against using the underscore.
RFC2821 ?2.3.5
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]
I have no problem with _smtp_client DNS name. While it is an issue
that many people have raised, I do not remember anyone mentioning that
there is a precedent for using underscores in DNS names. It has been
done before.
RFC 2782, the RFC for SRV RRs, specifies that underscores should be
used at the beginning of domain names to avoid collisions between SRV
RRs and other RRs "that occur in nature".
From the introduction to RFC 2782:
Introductory example
If a SRV-cognizant LDAP client wants to discover a LDAP server that
supports TCP protocol and provides LDAP service for the domain
example.com., it does a lookup of
_ldap._tcp.example.com
Since SPF will not be delivering mail to the _smtp_client RRs, and
since the _smtp_client will never be part of the domain of an email
address, I claim _smpt_client does NOT conflict with RFC2821 2.3.5.
In other words, _smtp_client domain names fall outside the universe of
RFC2821, and therefore there is no conflict.
Is anyone aware of any language in RFC 2821 that says it's definition
of domain name shall apply to all future uses of DNS that are in any
way connected to SMTP? Or such language in any other RFCs?
Izzy
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