First, let's determine how likely it is the domain in question is valid.
Now I'm in the states so my arrogant American bias will be showing...
but bear with me:

dpvkft -- The local-part of the e-mail address doesn't parse into any
first and/or last name combination I recognize as being even remotely
valid, nor are there enough vowels to make a word in any language I'm
aware of besides Hebrew. 

@xelero.hu -- The domain extension isn't one I recognize... nut it could
be valid.. hu... Hungary? Dunno... but they tend to use lots of vowels
in places I'd never imagine in my limited American experience. Fire up a
web browser... can you get to www.xelero.hu? 

Next... let's parse the NDR itself. The NDR is "unroutable address".
Well, I'd anticipate host unknown if the host was unknown, but
unroutable address taken at face value means the address associated with
the host is unroutable. Do they mean mine or theirs? Well... if this guy
is your brother Bob and you're confident the address is valid, perhaps
they mean yours. But I'm going to betg this isn't your brother Bob, so
let's work (at least temporarily) under the assumption its someone
else's fault. 

Let's find out if that is in fact the case... now I could rely on some
3rd party provider (a la dnsstuff.com) to give me an answer or I could
look for myself. Well,since this is a fishing lesson, we'll find out on
our own. For this task we'll use nslookup. We could use dig instead, but
nslookup is good enough... and yes, I'm in a hotel using a wayport...
which accounts for the delay between responses to the question:

nslookup
Default Server:  eth0.nmd.lah.dca.wayport.net
Address:  64.134.154.1

> xelero.hu
Server:  eth0.nmd.lah.dca.wayport.net
Address:  64.134.154.1

*** eth0.nmd.lah.dca.wayport.net can't find xelero.hu: Non-existent
domain
> set q=mx

> xelero.hu
Server:  eth0.nmd.lah.dca.wayport.net
Address:  64.134.154.1

*** eth0.nmd.lah.dca.wayport.net can't find xelero.hu: Non-existent
domain

I'll leave it as an exercise to the reader to determine what each of the
commands I executed above did, but the results will hopefully parse such
that you have an idea as to the validity of the recipient's domain.
Hopefully this doesn't mean your hot date last night gave you a bogus
e-mail address.


> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:bounce-
> [EMAIL PROTECTED] On Behalf Of Kim Schotanus
> Posted At: Thursday, September 16, 2004 4:50 AM
> Posted To: swynk
> Conversation: another strange NDR
> Subject: RE: another strange NDR
> 
> Nothing, what can I do?
> 
> 
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of
Chris
> Scharff
> Sent: donderdag 16 september 2004 11:50
> To: Exchange Discussions
> Subject: RE: another strange NDR
> 
> 
> <fishing lesson>
> Yes. So you've gotten an NDR. What have you tried so far to diagnose
the
> root cause?
> 
> > -----Original Message-----
> > From: [EMAIL PROTECTED] [mailto:bounce-
> > [EMAIL PROTECTED] On Behalf Of Kim Schotanus
> > Posted At: Thursday, September 16, 2004 4:01 AM Posted To: swynk
> > Conversation: another strange NDR
> > Subject: another strange NDR
> >
> > Another strange one; any ideas? Kim
> 
> 




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