RE: domain validation for e-mail addresses

As you can probably tell, I use PC-based tools for NSLOOKUP, so I had not
discovered the AS/400 NSLOOKUP shell subcommands that were available.  I
just prompted for AS/400 command parameters, and when I saw none, -assumed-
that there was no way to select MX records.

I know better than to assume.  Thanks you for correcting my mistake.

-Gary


-----Original Message-----
From: owner-midrange-l@midrange.com
[mailto:owner-midrange-l@midrange.com]On Behalf Of Joel Fritz
Sent: Wednesday, September 13, 2000 11:30 AM
To: 'MIDRANGE-L@midrange.com'
Subject: RE: domain validation for e-mail addresses


I think the nslookup on the 400 does support MX lookups.  (I've learned
enough to become marginally dangerous.)  Here's a lookup on us.ibm.com:

 > set type=MX
   >
 > us.ibm.com
   Server:  rbru.br.rs.els-gms.att.net
   Address:  199.191.128.103

   Nonauthoritative answer:
   us.ibm.com      preference = 20, mail exchanger = e32.co.us.ibm.com
   us.ibm.com      preference = 20, mail exchanger = e33.co.us.ibm.com
   us.ibm.com      preference = 20, mail exchanger = e34.co.us.ibm.com
   us.ibm.com      preference = 5, mail exchanger = e1.ny.us.ibm.com
   us.ibm.com      preference = 5, mail exchanger = e2.ny.us.ibm.com
   us.ibm.com      preference = 5, mail exchanger = e3.ny.us.ibm.com
   us.ibm.com      preference = 5, mail exchanger = e4.ny.us.ibm.com


   Authoritative answers can be found from:
   IBM.COM nameserver = ns.watson.IBM.COM
   IBM.COM nameserver = ns.almaden.IBM.COM
   e32.co.us.ibm.com       internet address = 32.97.110.130
   e33.co.us.ibm.com       internet address = 32.97.110.131
   e34.co.us.ibm.com       internet address = 32.97.110.132
   e1.ny.us.ibm.com        internet address = 32.97.182.101
   e2.ny.us.ibm.com        internet address = 32.97.182.102
   e3.ny.us.ibm.com        internet address = 32.97.182.103
   e4.ny.us.ibm.com        internet address = 32.97.182.104
   e31.co.us.ibm.com       internet address = 32.97.110.129
   ns.watson.IBM.COM       internet address = 198.81.209.2
   ns.almaden.IBM.COM      internet address = 198.4.83.35
   >

> -----Original Message-----
> From: Gary Patterson [mailto:midrange-l@nexsource.com]
> Sent: Wednesday, September 13, 2000 1:07 AM
> To: MIDRANGE-L@midrange.com
> Subject: RE: domain validation for e-mail addresses
>
>
> Just because it is interesting:
>
> If you want to see MX records for a given host, and you don't
> have your own
> copy of DIG (Unix, NT, etc.), go to
> http://www.samspade.org/t/dig.cgi?a=us.ibm.com (this runs the
> DIG CGI script
> at samspade.org, I am passing the us.ibm.com domain as an example a
> parameter.)  There are lots of freeware/shareware tools that include
> nslookup/dig/host functions for DOS/Win9x/NT/2K - including a
> free suite at
> samspade.org.
>
> There is an NSLOOKUP on OS/400 (I'm on V4R4), but it does not
> support MX
> lookups.
>
> -Gary Patterson
>
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