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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