Re: SMTP Problem
- From: "ObiWan" <obiwan@xxxxxxxx>
- Date: Tue, 7 Jun 2005 17:53:02 +0200
> I am in the process of setting up a new exchange server 2003 and seem to
> be having a problem sending mail to yahoo users at the moment. At first
> I thought it was that my PTR record had not propagated, but now I it has
> and I am bouncing mail to yahoo. Below is the error I am getting right
> now. I can send to my domain from yahoo accounts, but not the other way
> around.
<snippage>
Not sure if it's a DNS problem, but you may try the following;
first of all disable EDNS0 on your DNS server
http://support.microsoft.com./kb/q828263/
next, ensure that TCP DNS queries are working through your
firewall, to do so, fire up a command prompt and enter the
following commands
nslookup
server 4.2.2.2
set vc
set type=MX
yahoo.com
if the above works you should see a list of the yahoo.com
mail exchangers, the "set vc" above tells nslookup to use
TCP instead of UDP for the query and since we're querying
an external DNS (4.2.2.2) if the above works then your firewall
isn't blocking TCP DNS queries, if it doesn't work, revise your
firewall config to allow DNS queries over TCP and not only
over UDP
At this point, reset the spool queue of the SMTP and retry
sending some messages to a yahoo account
Let me/us (the group) know
Regards
--
* ObiWan
Microsoft MVP: Windows Server - Networking
http://www.microsoft.com/communities/MVP/MVP.mspx
http://italy.mvps.org
DNS "fail-safe" for Windows clients.
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http://www.ntcanuck.com/tq/Tip_Quarry.htm
.
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