[vox-tech] mail / DNS question

[Jan Wynholds]

Hey Pete:

Maybe point your MX record at belial.ucdavis.edu?  I know very little about
this, but from looking at RECEIVED stamps on email:

Received: from web9102.mail.yahoo.com (web9102.mail.yahoo.com
[216.136.128.239])

It looks like the exchanger knows about the DN and the IP, so if there is a DN
that points to the correct IP, the DN is all it needs?  I don't know why it's
true, I only know what is :)

I don't know why you would need a DN instead of an IP, but that is the 
way that our records come up:

# nslookup
> set type=MX
> dminfo.com
Server:         xx.xx.xx.xx
Address:        xx.xx.xx.xx#53

Non-authoritative answer:
dminfo.com      mail exchanger = 5 mail.dminfo.com.

Authoritative answers can be found from:
dminfo.com      nameserver = the.big.nameserver
dminfo.com      nameserver = another.big.nameserver.
mail.dminfo.com internet address = xx.xx.xx.xx
the.big.nameserver              internet address = xx.xx.xx.xx
another.big.nameserver          internet address = xx.xx.xx.xx

Seems a bit weird to me.

HTH,

jan

--- Peter Jay Salzman <p@dirac.org> wrote:
> hi all,
> 
> oddly, i'm a newbie at this sort of thing...
> 
> belial.ucdavis.edu is hosting the virtual domain roselug.org.  i think i
> set up the MX records correctly.  at least, nslookup looks good:
> 
>    p@satan% nslookup 
>    > set type=MX
>    > roselug.org
>    Server:         206.13.31.12
>    Address:        206.13.31.12#53
>    
>    Non-authoritative answer:
>    roselug.org     mail exchanger = 60 169.237.43.86.  <-- * correct IP *
>    
>    Authoritative answers can be found from:
>    roselug.org     nameserver = A.NS.JOKER.COM.
>    roselug.org     nameserver = B.NS.JOKER.COM.
>    roselug.org     nameserver = C.NS.JOKER.COM.
>    A.NS.JOKER.COM  internet address = 194.176.0.2
>    B.NS.JOKER.COM  internet address = 194.245.101.19
>    C.NS.JOKER.COM  internet address = 194.245.50.1
> 
> i reconfigured exim to include roselug.org as a local domain:
> 
>    local_domains = localhost:belial.ucdavis.edu:roselug.org
> 
> yet mail to postmaster@roselug.org is giving an error message which i
> don't really understand:
> 
>    A message that you sent could not be delivered to one or more of its
>    recipients. This is a permanent error. The following address(es) failed:
>    
>      postmaster@roselug.org
>      all relevant MX records point to non-existent hosts:
>      it appears that the DNS operator for this domain has installed an
>      invalid MX record with an IP address instead of a domain name on the
>      right hand side
> 
> ok, keep in mind i'm new at this sort of thing.   what's going wrong?
> why isn't an IP address ok to use on the "right hand side"?
> 
> pete
> 
> -- 
> GPG Fingerprint: B9F1 6CF3 47C4 7CD8 D33E  70A9 A3B9 1945 67EA 951D
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