Restrict Distribution Group to one external address

We currently have a dist. group that all employees are a member of, and is utilizited for other employees to send mail to everyone. We have this dist. group restricted to only accept mail from members of the same group. This prevents external addresses from spamming the group.

Now, we need to grant 1 single e-mail address permission to send to this dist. group, but still prevent other external addresses. How can I accomplish this?

Thanks,
SGKomenAsked:
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SembeeConnect With a Mentor Commented:
You will need to create a mail enabled contact for this one external email address. Once created you can add it to the "allowed" list. Once updated you may like to hide the contact from the GAL so that no one else sees it.

Simon.
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