Integrating Linux into exchange 2010 Environment

We have a stand alone Linux server that is setup to accept request from fax machines, scanners and printers and authenticate those users and services. It is also used as an SMTP host to relay mail. We also have an exchange 2010 environment. How can we get the stand alone Linux server that is relaying mail to send those documents and relay them through the exchange 2010 server and also how to get email relayed from the Linux server to the exchange 2010 server. I was thinking about creating a receive connector but was not sure and also not sure about the permissions.
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It isn't quite clear, you seem to want a Linux box and an Exchange box throwing emails at each other.
You probably want to use Exchange as a smarthost for the Linux box. Just configure a relay connector in Exchange and set the IP address of the Linux box to allow it to relay email from the Linux box.
To create the connectors in Exchange, you need to search the commands to setup a connector with the "anonymous" permission, which will allow to relay to any address (internal and external).
As for the Linux box, you need to configure the mail tool to use Exchange as the smarthost or relay.
techdriveAuthor Commented:
Let me provide more clarity. Both the Linux and Exchange servers sit internally in the organization. I only want the Linux server to relay mail to the exchange server not the other way. The printers and scanners send mail to recipients through Linux. We want them to send it like they do but allow the Linux server to send it to the exchange server. We want everything to go through the exchange server.
There are many guides to integrate a Linux system (ubuntu, Debian, centos, redhat, etc) into AD. Then there are guides on ocnfiguring the mail server postfix, exim, sendmail, etc to query the AD LDAP for email accounts.

Presumably, you want the Linux to function as a gateway that will be receiving the incoming emails checking them for virus, spam, etc and then passing them along to the exchange.
So long as you do not define the domain as local, the relay/transport will route the email messages to the exchange server.

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