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When I try to send an e-mail, I get ERROR 169: ‘EncryptMessage failure in SSPI module’. What’s wrong?

This is a bug in the Operating System’s SSPI (Security Support Provider Interface) module. It happens sometimes to Microsoft Vista/7 x64 Operating Systems and Windows 2008 x64 Operating Systems. To solve the issue, apply the latest Service Packs and Hotfixes. For details, please check