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exchange 2010 open relay

on my default and client receive connectors
0.0.0.0-255.255.255.255 are set in receive mail from these remote servers
is this dangerous
is  this an open relay

some documents on internet say it is some say its not
this is the default setting out of the box
also does this allow scanners to relay through it
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dougdog
Asked:
dougdog
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1 Solution
 
Simon Butler (Sembee)ConsultantCommented:
That setting along does not make your server an open relay. It simply allows the server to accept email from any server on the internet. If you change it, then you will affect what email you can receive.

Simon.
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cwstad2Commented:
As long as the relay isnt anonymous then you should be ok
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dougdogAuthor Commented:
The annonymous option is ticked
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dougdogAuthor Commented:
I was told only if externally secured was ticked this would mean open relay
Surely the default and client connectors need to receive mail from all networks and have annoymous ticked to accept mail from the Internet
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Simon Butler (Sembee)ConsultantCommented:
Externally secured turns the server in to an open relay.
Having anonymous on the default connector is expected and required for inbound email from the internet to be received.

Simon.
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dougdogAuthor Commented:
So as long as externally secured is turned off I'm safe
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Simon Butler (Sembee)ConsultantCommented:
In a default configuration, yes. If you have changed anything else then maybe not.
The test for open relay is pretty easy, you can do it yourself, so you can be sure for yourself that the server is secure.

Simon.
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