I installed the package MvcMailer for MVC4 project, but it does not show up in the reference area. I'm not able to do a reference for the IUserMailer.cs There should be a reference for Mvc.Mailer?
I'm using VS 2012 and .NET 4.5
The package and version of MvcMailer needed depends on both the the MVC and the .NET version you are using:
ASP.NET MVC3
Install-Package MvcMailer3
ASP.NET MVC4 with .NET 4
Install-Package MvcMailer -Version 4.0
ASP.NET MVC4 with .NET 4.5
Install-Package MvcMailer
This will likely change again when MVC5 and .NET 5 come out.