Is the Edge Transport Server necessary on Exchange 2007

Do I have to install Edge Transport Server to properly run my Exchange domains? I know it filters spam and other security tasks but can't my 3rd party Internet Security solution handle that?
mikeymail305Asked:
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grandebobCommented:
No, it is not required, but it is recommended.

You can forward port 25 straight to a Hub Transport server, and you will be able to send/receive from the internet.
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ThaVWManCommented:
You do not need an edge transport server in your domain, they are there as a best practice to shield your mailbox systems from the internet.  But they are not required.
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Rajith EnchiparambilOffice 365 & Exchange ArchitectCommented:
Edge transport role is optional. You can either use it or use third party companies like MessageLabs, Postini etc for your spam filtering. You can even run without any of these by just installing the anti-spam agents on your hub server.

http://enchiparambil.com/Installing_AntiSpam_Agents_On_Hub_Transport_Server.aspx
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