On Thu, 8 May 2008, Heiko Schlittermann wrote:
>
> Does exist some standard (RFC) saying that it's fatal mistake to have no
> A record for the first MX?
The relevant spec is section 5 of RFC 2821. It isn't very good :-(
The draft revision of the spec is better: see
http://www.ietf.org/internet-drafts/draft-klensin-rfc2821bis-10.txt
I think since only one out of three MX records for your domain are broken,
it is not reasonable to reject the message entirely. RFC 2821 says "If MX
records are present, but none of them are usable, this situation MUST be
reported as an error." (note the "none")
Tony.
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