How can I accept only specific sender email addresses from the internet

[Reid Thompson]

I'd like to configure my server to accept from the internet only emails 
from my family (approx 10 email addresses). I'd like to reject all other 
email.  How would I go about doing this -- is there a recipe for this on 
the internet somewhere that someone could point me to?

I.E. when traveling, or sending personal email from outside our home, 
i'd like to have our email clients send our mail through our server.

Thanks,
reid