How do I remove "Send As" permissions?

I have a strange problem with Exchange 2007. I have discovered that all staff can use the "Send As" capability.  I have checked the users mailbox's in the Exhnage Management Console and none have the permissions set under the "Manage Send As Permission" section but they can certainly do it.  Does anyone know how this can be? If I run the "Manage Send As Permission" wizard there are definitely no users listed with permission to send email on behalf of another user but they can nonetheless do it. Any ideas? Have I missed a setting somewhere?
SolveIT01Asked:
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Shreedhar EtteCommented:
Hi,

Refer this article:
http://www.msexchange.org/articles_tutorials/exchange-server-2007/management-administration/exchange-2007-permissions-and-roles-part2.html

Go to the section "Granting Send As Permission" and find who all and any group is haveing send as permissons.

After that remove users from the group.

Hope this helps,
Shree
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SolveIT01Author Commented:
Hi Shree,

Thank you but this did not help.  Either in AD or the Exchange Management Console I cannot find any user who has "Send As" or "Send on Behalf" ... nothing!  Yet they can all do it, very frustrating!
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Shreedhar EtteCommented:
I suspect that the Domain Users groups must have been added to some full admin permisson group.
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Shreedhar EtteCommented:
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SolveIT01Author Commented:
Hi Shree,

Brilliant, thanks.  The article allowed me to identify all users with send as permissions.

Many thanks, Marty
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