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external people using internal distribution lists

I was wondering if its possible for people from the outside to email to a internal exchange distribution list.
i am at 2003 currently but upgrading to 2010 soon.

we have distribution lists for finance and i want
john123@gmail.com to be able to email the whole finance distribution lists.
on the reverse side.
can i add john123@gmail.com to the finance distribution list
3 Solutions
As long as the finance group has a proper SMTP address name@domain.com then John can send them a message.  

To add john to the finance group you need to create a contact record for John and then add that contact record to the finance group.  John would then receive messages sent to the finance group.
you also need to disable the require authenticated users option on the group in 2010
Set-DistributionGroup <group> -RequireSenderAuthenticationEnabled
Create a contact for the Outside person. Then allow that person to the allowed senders for that Distribution list.

Under the Exchange General TAB in the DL's properties.
Then check Accept messages > Only FROM:
Add just the people/contacts that can send to it.

Add the contact to the distro list... so he gets copies.
jamesmetcalf74Author Commented:
thanks for the help guys
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