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.

example
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
jamesmetcalf74Asked:
Who is Participating?
 
A2the6thConnect With a Mentor Commented:
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.
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endital1097Connect With a Mentor Commented:
you also need to disable the require authenticated users option on the group in 2010
Set-DistributionGroup <group> -RequireSenderAuthenticationEnabled
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FDiskWizardConnect With a Mentor Commented:
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.
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jamesmetcalf74Author Commented:
thanks for the help guys
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