Question

Two mail servers for different accounts (As a temp setup between changeover)

Asked by: bnoyzy

I currently have a client who has their mail server setup externally with their web hosting which uses cPanel.
Recently I have setup SBS2008 inhouse and I want to move all the companies mail accounts to exchange. However this company recieves a large amount of SPAM on certain accounts and I do not want to move all the users accounts over to exchange until I have setup a Barracuda SPAM and antivirus device before the mailserver.
From my current knowlege on MX records and their purpose I do not believe my question is possible but I want to ask it anyway as their may be another method to solve the issue:

Is it possible to setup 2 mailservers for the same domain where 1 is queried first and if it does not have the recipient account present it forwards the query onto the other mail server?

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Asked On
2009-11-07 at 18:48:16ID24881138
Tags

Email Server

,

MX records

Topics

Exchange Email Server

,

SBS Small Business Server

,

Windows Server 2008

Participating Experts
2
Points
500
Comments
5

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Answers

 

by: ykampPosted on 2009-11-08 at 02:01:15ID: 25769979

I think no , but what I don't get is what you are trying to do. Why do you need to exchange server on the same domain?

 

by: MesthaPosted on 2009-11-08 at 07:21:33ID: 25770711

MX records do not work like that.
If you have both servers in the MX records then you will find that some email will be delivered to one server, other email will be delivered to another.
Email delivered to the "wrong" server will be NDR'd back to the sender with user unknown.

You need to decide which server is going to be the primary server and then have all email delivered to that server only. Then have the email sent to the second server some way.

If you don't want to setup Exchange to receive the email until you have an appliance in place, then you will have to wait, simple as that. I don't know if CPanel or whatever email solution is behind that is able to co-exist with another server. It is quite easy to get Exchange to co-exist - so Exchange accepts the email and then passes it off to another server if required, but that doesn't meet your requirements.

Simon.

 

by: bnoyzyPosted on 2009-11-08 at 16:54:16ID: 25772804

Thanks Mestha,
Thats what my thoughts were on MX records, thanks for clearing it up.
What your saying regarding exchange though may be more like what I am after.

Say my only MX record pointed to my exchange server so all mail goes there first.
Can Exchange then recieve a certain recipient request that does not exist in its own mailboxes and instead of sending back a NDR to the sender it passes the message on to the other mail server (without forwarding [changing the from address]) which then either places it in the mailbox (if it exists) or sends a NDR back to the sender.

My first thoughts are that this would not be possible because there would need to be some sort of partnership between the servers so they did not have to change the email in anyway (like adding themselves as the new sender etc). Since I'm new to exchange though I just wanted to put the question out there incase there was some way to accomplish it.

If not I will just continue to wait for the budget to buy the SPAM filter and migrate then.

 

by: MesthaPosted on 2009-11-09 at 03:58:11ID: 25775061

Exchange can send the email to another server if the recipient doesn't exist on Exchange. It is known as sharing the SMTP address space and is outlined here:
http://technet.microsoft.com/en-us/library/bb676395.aspx

Simon.

 

by: bnoyzyPosted on 2009-11-12 at 14:48:13ID: 31651484

Thanks Simon this looks perfect. I havn't had time to try it yet but I have had a read and it looks just like what I need.
Thanks for the help.

20120131-EE-VQP-002

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