Lock down a printer on the domain

I work for a state agency, We just set up a color printer (Lexmark CS410dn) on the network. Now other state agencies - who we have no contact with - are printing to it. I don't think its intentional, I think the printer is somehow showing up on their list of available printers.
     Is there a way to lock this printer down and only have that 1 agency be able to use it?
     By the way, this printer is in a different building than me. If the fix requires me to be physically at the printer than it may be a few days before I can do that.
     We're using Windows 7 Pro, x64.
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AkinsdNetwork AdministratorCommented:
Are the 2 agencies using the separate domains.
If yes, remove the print permission from everyone, and add print permissions for the domain users of the desired domain

This does not prevent users from connecting directly and printing to it.
To fix that, turn on print authentication on the device if it supports it
JohnBusiness Consultant (Owner)Commented:
You could put the Printer in a folder/organization group that the other agency has no access to and will not see. Any attempt to add would end in failure.
Mal OsborneAlpha GeekCommented:
Depends on how they are printing to it.

It is simple enough to use normal permissions and create a group with access, (as others have mentioned), but sometimes users create their own IP connection and just print straight to the printer.

On a few sites I have created a separate IP subnet and LAN just for printers. Simple enough to do, you just need a 2nd NIC in the print server, and another switch (or VLAN). With no routing protocols loaded or static routes in place, there is no way client machines can directly print.

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AkinsdNetwork AdministratorCommented:
To elaborate on my comments above.
If the printer has print authentication feature, and if enabled, this will block out anyone without a code
You would save the code in the print driver preferences for the legitimate users.
Any job sent to the printer without the code will be deleted automatically even if they connect via IP
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