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How does 2010 exchange decide which server receives mail?

Posted on 2011-09-19
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Last Modified: 2012-05-12
Greetings experts:

I just installed a new exchange box into my existing 2010 environment.  I had two exchange servers residing in different offices connected via VPN.  Everything worked fine before I added the new box into the main office, now there are two exchange servers in one office and one remote box.  When the new server came online mail stopped.  Then I figured out that the new server wanted to route all mail through it.  So I changed the firewall policy to route mail to the new box and it started working.  Then I created the smart host, and everything is back to normal.  So basically the original server, would not accept mail.

The question is, I want to add another exchange box, how do I keep the existing mail routing as is..

I'm adding another box so I can move it offsite and setup DAG's and have DR.

Thanks for your help,
Kacey
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Question by:Kacey Fern
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10 Comments
 
LVL 49

Expert Comment

by:Akhater
ID: 36565128
I am willing to try to help on this one but I don't have enough data, are you talking about incoming or outgoing emails ?

Outgoing emails are routed depending on the send connectors while incoming emails do not depend on exchange at all, it depends on the device delivering the emails where it is delivering them to

I know I didn't answer the question so please let me know what you still need

thanks
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Author Comment

by:Kacey Fern
ID: 36567192
Both.  As I stated, all was working fine, I didn't change any connectors.  Then after I installed the new exchange box, mail stopped working.  I didn't change the way anything worked, Exchange changed it during the install.

Then I changed the policy on the firewall to route mail to the new box, and it started working.  So somehow during the install, exchange refused mail at the original box and changed it to the new box.

I'll check the connectors and see if there are any clues in there.
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LVL 49

Expert Comment

by:Akhater
ID: 36569689
no changes in the send or receive connectors are made during the installation of exchange.

mail routing will not change unless something was changed
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Author Comment

by:Kacey Fern
ID: 36582640
right.. I just checked and no changes were made to the current send / receive connectors.  I just confirmed that the installation added receive connector on the new server.  I'm pretty sure it added a send connector, because when I went into the send connector on the new server, I had to manually add the smart host, which was already added on the original server.

Maybe I'm using the wrong terms for you.  

I know exchange can't change the routing of the mail to the server.

What I'm saying is that, once the new server was installed.  The original Exchange box, would no longer accept or send mail.  So what I had to do was change the routing of the mail from Internet from the original server to the new server, and add the smart host to the new server so we wouldn't be reported as a spammer.  This allowed Exchange to start working properly again.

The question is, how does exchange determine which server will accept mail, and which will not.  Is it a front end thing?  if so where is that set?

Thanks for your help...
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LVL 49

Expert Comment

by:Akhater
ID: 36582866
>>What I'm saying is that, once the new server was installed.  The original Exchange box, would no longer accept or send mail.<<

this is the part I don't agree on with you, exchange does not do such a thing you do
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Author Comment

by:Kacey Fern
ID: 36586843
I'm sorry you don't agree, but it's what happened.  I didn't think so either, but once I changed the routing of the mail from the original server to the new server, mail started flowing again.

I guess I'll just take my chances and install on the third box and see what happens.  If I can't figure it out, I'll just call MS.

Thanks for your replies.

Kacey
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LVL 49

Expert Comment

by:Akhater
ID: 36588305
Kacey please don't take the "I don't agree" part wrong, it is just that to receive external emails the receive connector should have anonymous enabled (which is not by default)

1) If your old server was receiving emails = anonymous was selected on its receive connector and this was done manually
2) Installing a new server will NOT disable anonymous on the receive connector of server 1 so your old server should still be able to receive emails
3) when you install a new server anonymous is NOT enabled on the receive connector so the NEW server should not be able to receive emails


So, in your case, the only thing i can think about is that the IPs of the servers changed
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Author Comment

by:Kacey Fern
ID: 36956919
installing exchange this week on second server.  will update.. had some delays
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LVL 49

Accepted Solution

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Akhater earned 2000 total points
ID: 36956986
tx for the update
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Author Closing Comment

by:Kacey Fern
ID: 36988381
thank you for your help, I don't think this will be helpful to anyone else.  I didn't add question to knowledge base.  I did the install on the second server and all went as planned.  Not sure what happened with the first box.

Cheers,
Kacey
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