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Problem with .NET 4 based SMTP OnArrival sink in Win 2008 R2

I had .NET 3.5 implementation of OnArrival sink for SMTP server that has been successfully running for years. When I recompiled it to .NET 4 and reinstalled it the SMTP server stopped picking it up. I suspect it has something to do with the default verion of .NET used by SMTP server interop to communicate with the sink (it seems that it wants to use older version of the framework). Any suggestions?

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