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2nd Exchange Srvr queuing incoming mail

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by kenneth

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I trying to find out if this is possible, and if so how to go about doing it. I'm running BackOffice 4.0 SP6a with Exchange 5.5 SP3 on the PDC. I have installed Exchange on a BDC joining the PDC.

What I want to happen is that when the PDC ever goes down that the incoming mail then get routed over to the BDC and held there until the PDC comes back up.

Let me know if you need more information. Thanks for your help.

Ken

5 replies

by dheupel

I presume that the BDC will be located on the same network segment as the PDC? If this is the case, and if you make the new Exchange Server on your BDC a server within the same site (very important), it should do just what you want it to. There isan option in Exchange Admin (I forget what it is right now, and I'm not in front of my XCHNG server - please consult on-line help/documentation) that will allow you to read and share the directory (LDAP address book) from your "primary" XCHNG server. Make sure this is enabled. Also, tell the "secondary" server to forward all mail to the "primary" XCHNG server. Then, if the PDC should ever fail, your BDC will be promoted to PDC, and at the same time, your "secondary" XCHNG server should receive and queue mail until the PDC comes back online.

Good luck.

by garetjax

Kenneth,

To provide this functionality, you need to do the following:

1. Install an Internet Mail Connector (IMC) on your BDC Exchange install and reinstall the Exchange service pack/hotfixes.

2. Add additional A/MX records for your BDC Exchange IMC (your DNS if you manage or your ISP DNS if DNS is hosted externally) and ensure that SMTP (port 25) is open on your firewall to allow incoming/outgoing traffic to the BDC IMC. Make sure that the new MX record has a higher value (lower priority)

3. Configure internal Exchange routing to establish primary/backup MX role (routing costs)

With the above configured, incoming mail should be delivered to the BDC and transferred via the MTA when the PDC comes back online.

Hope thishelps.

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