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Screencast – Disable Open Relay in Exchange 5.5

By default the Exchange 5.5 installation allows open relay through the server. Prior to SP3 for Exchange 5.5 this could be fixed only through changes in the registry. After applying SP# or SP4 for Exchange 5.5 there is an additional option in the Routing TAB of Internet Mail Service – Routing Restrictions. Here you can see how you can disable Open Relay through routing restrictions.

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