RE: [cobalt-users] MX record question / Raq4i

["Chris Demain" <cdemain@xxxxxxxxxxx>]

> The issue is not whether the above configuration will work.  It is about
> whether the configuration adheres to the RFCs.  You use a SMTP server to
> run a mail service.  DNS has its responsibility in the configuration of a
> mail server.  The RFCs state that a service accepting mail should have
> valid MX record for all hosts which it serves.  They also states that the
> domain name should have a valid MX record.  ALthough the remote
> system will fall back to the domain A RR if there is no MX, that doesn't
mean that
> running a mail service for the said domain without a MX record is correct.

Right, got that part.  My question, I suppose, is why MX each host instead
of a "blanket" MX for the domain.  The only sane reason I can think of for
having MX for each host/subdomain is for when different mail swervers are
used, i.e. domain goes to mail., but www. goes to mail2.

> SMTP servers that adhere to the RFCs to the letter may reject mail from
> servers which do not comply with the RFCs.
>
which? 822?

> Regards,
> -sm