Here’s my scenario, currently we have two sonic-wall email security appliances, one virtual at our co-location and one physical at our main office. Here’s what I would like to achieve.
1. Have both devices operational.
2. Appliance at main office is primary and accepting all mail and delivering it to exchange. ( This is currently in place now)
3. All necessary changes are replicated to DR virtual appliance.
4. If main office appliance is not available for whatever reason mail is sent to virtual appliance, analyzed and then delivered to exchange.