Hi, A junior member of the Exchange admin team ran an old email address policy which has added a new email address for all our external contacts. Unfortunately these contacts have gained our internal email address and now I need to remove this en-masse from all users within 1 specific OU in AD. Looked into Powershell, but not getting anything close to what i am looking for... Any ideas?

Hello,Are you using Exchange 2007? This is normal behavior in it and refer similar thread for the workaround...http://social.technet.microsoft.com/Forums/en-US/exchangesvradmin/thread/be652bc1-53ec-44cb-9945-d96dc9b6ad54/You can use ADMofidy.net or PowerShell to remove internal smtp address...Amit Tank | MVP - Exchange | MCITP:EMA MCSA:M | http://ExchangeShare.WordPress.com