I am just beginning to use the MailSystem.NET library. However, I cannot figure out where to add the .dll files so I can reference the namespaces in my classes. Can someone please help me? I am using Visual Studio 2010. Thank you for any information, there is so little online.
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You probably are looking for AddReference dialog accessible from Project Context Menu (right click..)
From there you can reference dll's, after which you can reference namespaces that you need in your code.
For Visual Studio 2019 you may not find Project -> Add Reference option. Use Project -> Add Project Reference. Then in dialog window navigate to Browse tab and use Browse to find and attach your dll.
Another method is by using the menu within visual studio. Project -> Add Reference... I recommend copying the needed .dll to your resource folder, or local project folder.
Source: Stackoverflow.com