Need to Block Internal Users from Sending to Internal Recipients

Greetings Experts - apologies if I have posted into the wrong topic area. I have Windows Server 2003 SP1 Domain Controllers and Exchange Server 2003 SP2. Single Forest, Single Domain, approx 1000 mail-enabled users.

My company has come up with a requirement to have an internal mailbox created that can only send messages internally to one recipient in the Global Address List, and be restricted from sending to any other internal recipients. They will also not be allowed to e-mail externally, but I have already managed to sort this out.

I know that I can set Delivery Restrictions on the rest of the mail-enabled AD accounts in the domain to 'Accept Messages from everyone except...' and then specify the mailbox that I want them NOT to accept e-mails from.

The trouble is, I don't really want to visit 1000 mail-enabled Active Directory accounts to set this Delivery Restriction individually. I tried to use, but unfortunately this tool (good though it is) does not provide for editing this particular parameter of a mail-enabled AD account.

Does anyone know of a quick way to achieve what I am trying to do, i.e. restrict one mail-enabled AD account from being able to send messages to some/most of the domain's other mailboxes?

Points to those who provide answers!

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CalamityClevAuthor Commented:
Hello RobinHuman - many thanks for the response. In the end (and after researching the solution a bit more) I found a way of doing this through ADModify.Net using the CUSTOM tab and a Multivalued Append tick box.

Still, the tool you recommend is quite useful and I am going to look into it further to see if it has any other application I can use it for.

Thanks again,
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