enable mail to be sent from non-authenticated users

are you trying to send emails out or back in? is this on the whole server - all users?

set-ReceiveConnector Receive -permissiongroups AnonymousUsers

and set the smtp connector

Do you want users to be able to identify themselves as this mailbox when using Outlook, i.e. have the "From" field in addition to "To", "CC", and "BCC? Do you want to allow anyone -- from inside and / or outside the organization to do this, or only internal users?

I want people to be able to send to it from anyone at all

to set incoming mail: go into the exchange command shell and type
set-ReceiveConnector Receive -permissiongroups AnonymousUsers

to set outgoing mail: create a smtp send connector for a domain called *

thanks cuteadder, but where in that command do I specify the Northern distribution group that I created?

those commands should change it so everyone (internal or external) can talk to everyone else.

you can try
set-ReceiveConnector Receive -permissiongroups northern

but I think that will change it so only they can receive email...

try my earlier comment and see where that goes...

this is what I got:

[PS] C:\>set-ReceiveConnector Receive -permissiongroups AnonymousUsers
Set-ReceiveConnector : The operation could not be performed because object 'Rec
eive' could not be found on domain controller 'ausyd04.globalgossip.net'.
At line:1 char:21
+ set-ReceiveConnector  <<<< Receive -permissiongroups AnonymousUsers

you don't need to do it through the command line... can you explain exactly what you want to accomplish?

set-ReceiveConnector "Receive" -permissiongroups AnonymousUsers

"Receive" - is the name of the default receive connector - your name may be different...

also make sure you do it throught the exchange command shell not the microsoft shell - I've made that mistake before!