How do I restrict an Exchange 2007 Public Folder e-mail to 1 specific inbound outside sender

I have a public folder on Exchange 2007 that I use for e-fax purposes. I need to be able to restrict this folders e-mail to only accept 1 inbound outside address.

So, Faxes @xxxxx.com only needs to accept e-mail from message@inbound.efax.com

Looked at transport rules and mail flow on the folder itself and coming up blank.
ADJ-adminAsked:
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Simon Butler (Sembee)ConsultantCommented:
Transport rules can do this for you, although it cannot reject the email at the point of delivery.

The rule will be something like

Sent to <address> from external sender, reject the message unless message from x

You could also try unless headers contain text, and put in the domain the messages come from.

The other way would be to create a contact for the external address, then use that to restrict the traffic.

Simon.
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