Recieve Connector

One of our programmers setup an application on 100 computers (same subnet) that relays email off our exchange 2007 server to internal and external recipients. Rather then setup an receive connector that allows anonymous access to entire subnet, is there a way to setup a new recieve connector that will only allow 3-6 domain users (the program uses the same email accounts to send the emails) to connect on port 25 and send mail from any of those 100 computers to internal and external recipients. Originally, I setup an anonymous relay connector and explicitly defined the ips but there are simply too my ip's to list at this point. I also don't want to allow the entire subnet to relay mail off our exchange server. Any help would be greatly appreciated.
FREDARCEAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Chris DentPowerShell DeveloperCommented:

Can the application authenticate for SMTP? If not, you're a bit stuck with the relay.

Of course, if the mail only needs to be delivered to other internal users you don't need a relay at all, but I imagine that would be far too easy.

Chris
FREDARCEAuthor Commented:
I'm going to look into secure smtp for those users. They do need to send internal and external.
 Thanks Chris.
mwhitworthCommented:
Setup a hub transport rule to allow/disallow mail to those users.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Exchange

From novice to tech pro — start learning today.