this may be a long shot....but you can give it a try..
in exchange 2000-2003 environment admin groups have DENIED send as permission assigned to them on the smtp virtual server.....
so using ADSIEdit go to the smtp virtual server
configuration\services\microsoft exchange\CN= yourdomain\administrative group\first administrative group\servers\your server\protocals\smtp\CN=1
right click ....properties....security......and make sure that person or group
is not assigned denied "send as" permission.....
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