Re: is this DNS setup RFC-correct ?

On Mon, Oct 25, 2010 at 02:20:51PM -0200, Leonardo Rodrigues wrote:
>
> I have a domain (domain.com.br) with lots of subdomains in the
> format nnn.domain.com.br.
>
> nnn.domain.com.br (about 40 different subdomains) have only 2
> (two) DNS entries:
>
> nnn IN MX 10 server.nnn.domain.com.br.
> nnn IN TXT "v=spf1 include:domain.com.br -all"

Does an A record exist for server.nnn.domain.com.br? If not, how
are we supposed to figure out where to actually direct mail for
postmaster@nnn.domain.com.br? If you don't have an A record for
server.nnn.domain.com.br, I believe you have a dangling MX record.

Is the MX record supposed to be ?:

nnn IN MX 10 server.domain.com.br.

Maybe I've missed something in your problem description. Some very
smart people have responded before me without mentioning this. I
probably missed something.

-- Scott Lambert KC5MLE Unix SysAdmin lambert@lambertfam.org

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