Exchange 2010 ATRN & ETRN

For mult reasons I am seeing a severe need to config my Exchange 2010 for either ATRN or ETRN to work with DNS2Go mail routing. There are very little articles out there stating how to accomplish and in fact several stating that ETRN is not possible with Exchange 2010 and nothing on how to change the default port from 25.

What little I see is that ATRN is not native but rather a separate utility that can be downloaded from sites such as BUT that is 32bit from what I can see and obv running Exchange 2010 I am running 64bit O/S.

Has anyone here done this kind of setup?? DNS2Go and other vendors of the like say many relay email in this fashion but see basically nothing on this. Which process should I use and what would the steps be to config.

P.S. Not that this should matter but the Exchange server is running 2008R2 and is parked on VMWare.
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Simon Butler (Sembee)ConsultantCommented:
There is no native support for either of those protocols in Exchange 2007 or higher, so you would have to go to a third party tool. Although considering how popular Exchange is I would be surprised if ETRN/ATRN are the only options.

Most vendors of this kind will use SMTP delivery to another port. It is trivial to configure Exchange to accept email on a non standard port - just create a new Receive Connector with the port number you want to use on it. You will need to set the remote IP address range as per the relaying service, then open the port.

The other, more common method is to use NAT forwarding on the firewall. This forwards port 2525 (for example) to port 25 internally. No need to change anything in Exchange.


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bcp_cnsllcAuthor Commented:
So far there has been no answer that will allow me to connect with DNS2Go's mail retrieval service besides hiring them but sure this would work in most cases. I will prob try this again at a later time when I have more time.
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