Is Exchange 2010 Edge Transport role required?

richtree
richtree used Ask the Experts™
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I plan to upgrade my Exchange 2003 to 2010. I have only single Exchange 2003 server. When I read through the Exchange 2010 documentation, it mentions that CAS, Hub Transport, Mailbox roles can be on the same computer, and Edge Transport role must be outside the domain.
Q#1. Is Edge Transport role required?
Q#2. If Edge Transport role is skipped, what features/advantages are lost?
Q#3. Does my MX record point to Edge Transport server or CAS server?

Thanks.
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If you are only having one Exchange server then you don't need an Edge server. The Hub Transport role will deal with the transmit and receive for you.

You don't lose any feature as you only have the single server. Edge servers are good when there are multiple Exchange servers and you are trying to limit internet access (for example)

MX records should point directly to the CAS server.
Awarded 2009
Top Expert 2010
Commented:
The above is wrong.

The MX record should point to a hostname which uses your public IP address that is then forwarded on port 25 to the HUB TRANSPORT server.

The EDGE TRANSPORT role has nothing to do with restricting Internet access.  It is mainly for message cleansing and management.  Some of whichyou can do on the HUB TRANSPORT server.

Author

Commented:
I am confused. If external mail server connects to Hub server, then when will the Edge server be involed? Can you provide a scenario where Edge is involved and describe how mail flow between those roles?
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Awarded 2009
Top Expert 2010
Commented:
Edge Transport is in your DMZ, it's used when you want to control the mailflow to your internal network and want all the message cleansing tasks to be completed before they hit your exchange organisation.  Mainly larger exchange organisations.

The flow between those roles is determined by the connectors you configure for the task.
Top Expert 2011
Commented:
It is as demazter says.
Without a Edge Transport the mail should be directly deliverd to the Hub Transport server role. You could install a stand alone server in your dmz with active directory lds and the edge transport role on it to handle incoming and outgoing email, in most cases this server does the anti virus and spam filtering so junk is filtered before it can enter your corporate network.

To get it more clear take a look at this picture about edge transport: http://www.infostruction.com/wp-content/uploads/2011/01/Edge-Transport-Role.png

Author

Commented:
Does it means that the MX record points to Edge server, then forward mails to Hub then to Mailbox?
Awarded 2009
Top Expert 2010
Commented:
The MX points to an A record.  Which in turn points to an IP address.

Your router/firewall will then forward port 25 to which ever IP you tell it to.

If this is an Edge Transport server then yes it will go here first then to a Hub Transporr server.  If it's not an Edge Transport server then it will go to a Hub Transport server instead.

Author

Commented:
Thank you.

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