[Mailman-Users] Hostname in mail headers
Harald Meland
Harald.Meland at usit.uio.no
Wed Feb 24 21:36:22 CET 1999
[Marcus C. Gottwald]
> I was sure that none of the involved MTAs that I have control
> over did something like that. But when I was digging into it,
> I found that all mails were addressed to listname at main-fqdn
> although had been sent to listname at some-other-fqdn. This
> happens when the other fqdn is not a "real" DNS-entry, but a
> CNAME.
Using CNAMEs in mail addresses is Wrong. So don't. Cf RFC 1123,
section 5.2.2:
5.2.2 Canonicalization: RFC-821 Section 3.1
The domain names that a Sender-SMTP sends in MAIL and RCPT
commands MUST have been "canonicalized," i.e., they must be
fully-qualified principal names or domain literals, not
nicknames or domain abbreviations. A canonicalized name either
identifies a host directly or is an MX name; it cannot be a
CNAME.
--
Harald
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