On 2023-12-01 John R Levine via Exim-users <exim-users@lists.exim.org> wrote: > It appears that Jeremy Harris via Exim-users <j...@wizmail.org> said: [...] > > Our log says that message was aimed at exim-us...@cumin.exim.org
> Oh, I see the problem. lists.exim.org is a CNAME for cumin.exim.org, > and qmail is standard compliant per RFC 1123: > 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. > When I put in an explicit route it uses that rather than resolving the CNAME, > unrelated to IPv6. > It's poor form to use a CNAME as a mail domain, and worse form not to > do what the standard says, but I suppose that horse left the barn a > long time ago. Hello, Afaict this part of rfc1123 has been superseded by RFC 2821 [1] anno 2001 which explicitely allows CNAMES. cu Andreas [1] since superseded by rfc 5321 -- ## subscription configuration (requires account): ## https://lists.exim.org/mailman3/postorius/lists/exim-users.lists.exim.org/ ## unsubscribe (doesn't require an account): ## exim-users-unsubscr...@lists.exim.org ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
