Re: Exchange can't send email to one of the domains

From: Boris Lokhvitsky (msexpert_at_community.nospam)
Date: 11/23/04 

Date: Mon, 22 Nov 2004 17:04:40 -0800

Thanks for answering Kevin,

I get the same results on both servers. Correct MX entries.

Exchange's SMTP, however, is performing DNS queries in a different manner
(for example, it is always using TCP, not UDP, for DNS queries), so it
cannot be a big argument... and I did not perform TCP based nslookup
queries.

http://support.microsoft.com/?id=263237

Thanks,
Boris

"Kevin Longley" <kwlongley@cirtronics.com> wrote in message
news:e8dBYRO0EHA.1188@tk2msftngp13.phx.gbl...
> If you use Nslookup to verify the mx records of the domain in question,
from
> each of the exchange servers, what do you get for results?
>
> "Boris Lokhvitsky" <msexpert@community.nospam> wrote in message
> news:eVIhsLM0EHA.2572@tk2msftngp13.phx.gbl...
> > Hello All,
> >
> > Here's a strange problem. There are two Exchange 2000 SP3 servers (on
> > Windows 2000) hosting mailboxes, both belonging to the same
organization,
> > administrative group, and routing group. No SMTP or any other connectors
> > configured. Virtual SMTP servers seem to be configured identically on
both
> > servers. Both servers use the same DNS servers for DNS resolution. Both
> > servers (and DNS servers too) have private addresses and are behind a
> > firewall/NAT. No SMTP proxies / gateways / smart hosts for the outgoing
> > e-mail.
> >
> > Now the problem itself: _ONE_ of these servers can't send out e-mail
> > messages to _ONE_ specific SMTP domain on the Internet. The mail just
sits
> > in the queue until its TTL expires. All other mail for other domains
seems
> > to work fine. Second Exchange server can send e-mail normally to all
> > domains
> > including the domain in question.
> >
> > On DNS server it can be seen that MX records for the domain in question
> > appear in the cache when sending e-mail from the "good" server but not
> > when
> > sending e-mails from the "bad" server. Seems to be a DNS related issue
> > (strange). However, messages sent to the same domain from the "bad"
server
> > using a command prompt Telnet session directly to SMTP, go through just
> > fine. Hence - still an Exchange configuration issue?
> >
> > I'm out of ideas... any thoughts?
> >
> > Thanks a lot in advance,
> > Boris
> >
> >
>
>

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