MvcMailer sends emails using the MVC views as Email Body with no effort. Here's a quick list of features: a) Use Razor/WebForms views b) Use Master pages c) Write Testable Code d) Pass values to your view using ViewBag or ViewModel and e) Generate Absolute URL using Url.Abs method [New in V0.5].
MvcMailer has a MailerBase class that extends ControllerBase class. So, Mailers are just like your Controllers. As a result, you can use all the controller goodies without any learning curve, period. The end result is a professional looking HTML email body ready for your to send to your website users.
This package has a very good amount of test coverage and if you want, take a look at the project site.
V0.7 Adds testability to projects using MvcMailer.
This package has no dependencies.