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Exchange is routing through Domain Controllers

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scouse12

Technical User
Nov 1, 2002
8
GB
Hi,

I am having a weird problem. Apologies for the length of the post.

I have recently added a second exchange 2003 server to my exchange site, which is a single domain, single site setup.

Most of my users are on the first server "email1", they can send and recieve messages to and from each other, and the internet fine.

I have a couple of us IT bods on the new server "email2". We can receive mails from users on "email1" and the internet fine, and send mails to each other on "email2" just fine, however we cannot send messages to any users on email1 or the internet, we get a #5.7.1 smtp;550 5.7.1 Unable to relay for winston@joebloggs.com error

I have the ip address of email2 and allow auth users to relay in the relay box on email1.

Looking through the logs, i have #984 info messages as follows

SMTP GetNextHop returned hr=0x0 in 0ms.
DestAddr=<email1.joebloggs.com>, Type=<SMTP>
MsgType=0x0, NextHopType=SAME_ROUTING_GROUP
Type=<SMTP>, Class=<>, SchedId=0xffffffff
RouteAddr=<email1.joebloggs.com>
Connector=<DNS>

Which would indicate that the routing engine knows where to send the message for delivery, however i am also getting
#7004 errors

This is an SMTP protocol error log for virtual server ID 1, connection #14. The remote host "10.1.1.2", responded to the SMTP command "rcpt" with "550 5.7.1 Unable to relay for freddy@joebloggs.com ". The full command sent was "RCPT TO:<freddy@joebloggs.com> ". This will probably cause the connection to fail.

10.1.1.2 is one of our Domain Controllers, and is also a GC and is also one of our DNS servers.

I can telnet from email2 to email1 and send mail manually fine.

If i add the address of email2 to the smtp relay tab on the Domain Controller then mail flows ok, looking in the headers you see that its being relayed through 10.1.1.2
Obviously this is not the best solution although it does get mail flowing between both servers,

There doesnt seem to be any DNS problems.

Any ideas?

Thanks for your time

Chris
 
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