I simply went up to GitHub and searched for your examples, found them, downloaded them.
Anyway, I'm using Visual Studio 2012 Ultimate. Windows 8.1 with .NET Framework 4.5.1 installed with Windows 8.1
using Aspose.Email.Printing;
Error96The type or namespace name 'Printing' does not exist in the namespace 'Aspose.Email' (are you missing an assembly reference?)C:\Developer\Aspose_Email_NET-master\KnowledgeBase\PrintingFeatures\CSharp\Program.cs5026PrintingFeatures
So, looking at the program files (x86) directory, I don't see any printing assembly or what-not.
The printing namespace is available only in the .NET 3.5 dll of Aspose.Email. It is located in the “Program Files (x86)\Aspose\Aspose.Email for .NET\Bin” directory as shown in this screenshot. Please add a reference of this DLL to your application and try it again. Let us know if we can be of any additional help to you in this regard.
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