How do you configure an e-mail security appliance for Exchange?

How do you go about adding a e-mail security appliance in terms of configuring e-mail routing?
If you have Exchange 2010 and a product like Symantec Messagign Gateway, Barracuda or Proofpoint, do you configure the security appliances to get e-mail first? If so, how? Is that updating your MX record to point to those devices?
Then from those devices, you tell them to point to Exchange 2010 server? What if you have multiple Exchange 2010 servers/databases (no dag)?
garryshapeAsked:
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Peter HutchisonSenior Network Systems SpecialistCommented:
Yes, I suspect the MX record is the first thing to change to point it to the appliance. It will then do any anti-spam and anti-malware checking before forwarding mail onto your mail servers e.g. Edge or Hub Transport servers.
If you have multiple servers, you could specify a round robin dns name or to a network load balanced name, if the servers are setup like that.
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systechadminConsultantCommented:
First thing is MX records you need to point to these devices. Second point. Mail routing works on the HUB transport server concept. You will need to create the Send connector and receive connector on Exchange server so that it should point  to these devices. And Also you will need to open the port 25 between these devices and your exchange servers.
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garryshapeAuthor Commented:
Ok so there'd be a "Smarthost" Send Connector, for example, that has the IP address of that appliance? Option set to "Route mail through the following smart hosts)?

As for Receive Connectors, there like 8 of them between two of the Exchange servers so I'm not sure which one to choose.
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systechadminConsultantCommented:
Yes for send connector, u need to specify the IP address of the appliances. for recieve connector you may be u will need to create new recieve connector. Most probably its not required you can ask the vendor if its required. it depends on the vendor product.
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