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Exchange Fault Tolerance

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by mhitchiii

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I have two Exchange servers in different sites. One is currently listed as the mail server on the MX record. If this server should ever go down, I would like the other to be able to pick up any mail that comes in while the primary Internet Mail Service is down. How do I do this?

5 replies

by tony.colgrove

Make sure the IMS is installed on the second server, and that it has a way to send/receive SMTP traffic from the internet.
Have an additional MX record with a higher value that points to the second server. ie
mycompany.com MX 10 mail1.mycompany.com
mycompany.com MX 20 mail2.mycompany.com
(An A class would also need to be made for the second server, if it does not already exist)
When people are trying to send you mail, there SMTP server it will always try the lowest value first. If that server is unreachable it will try the next lowest value.

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