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After effects of modifying the Hub default recieve connector

I have an exchange 2010 environment using the standard HUB and Edge Transport configuration with Edge synchronization working correctly.    I now need to set up an additional non Edge Transport basic SMTP server in my External zone to support a project.   Due to this, I also need to set up the HUB server to accept mail from this new SMTP server.  
My first thought would be to modify the current ‘Default receive Connector’ on the HUB server and check ‘anonymous users’ under the permissions group tab.  I would leave the current selections ‘Exchange Users’, ‘Exchange Servers’, and ‘Legacy Exchange Servers’ checked as well.  This should allow the new SMTP server to get past the authentication piece.  
My Question:  If I do check the ‘anonymous users’ box on the default receive connector on the HUB, will this cause any problems with permissions or mail flow between the HUB server and the Edge Transport Server?  It there anything else I may be missing?  I am new to Exchange and unfortunately I do not have a Test environment to experiment with.  

1 Solution
Jamie McKillopIT ManagerCommented:

I would not modify the default receive connector. You will end up turning your Exchange server into an open relay. Use the following instructions to create a new receive connector for your new SMTP server - http://blogs.technet.com/b/exchange/archive/2006/12/28/3397620.aspx

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