I am trying (and not yet succeeding) with configuring the following:
(addresses have been changed for this example):
1. Exchange Server (on our internal network) at 192.168.1.xx
2. External address for the Exchange server is at 204.205.206.yyy
3. Barracuda SPAM server (used to scan incoming mail) is at 69.70.71.72
- All incoming mail for our organization goes to 69.70.71.72 (This is where the MX record points)
-The Barracuda SPAM server checks all incoming mail for us and relays it to 204.205.206.yyy. (We do not allow incoming mail to our server from any address other then 69.70.71.72)
- Outgoing mail is sent from our Exchange server directly to it's destination Outgoing mail does not go through the Barracuda SPAM server.
My questions:
- Should I use a 1:1 NAT rule here or do I need one SNAT rule for incoming mail and one DNAT rule for outgoing? What would the rule look like?
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