We have right now 4 email servers that are working with a Barracuda smart host. However, two of them need to be shutdown, they are the old servers. The problem I have now is that outgoing emails depend on the two old servers for the SMTP traffic. How do I make it so the two email servers that exit to the internet through a smart host Barracuda work with one another.
Here is how it shows in the Barracuda log:
Source IP: is-xx-ms01.is.ad[172.xx.xx.12]
Source IP: is-yy-ms01.is.ad[172.yy.yy100.221]
Those are the old servers relay SMTP traffic. In the Barracuda device I am all set with the server entries. The two old servers don't have mailboxes anymore. I need the two Exchange 2010 to work without the two old servers.