DotNetOpenMail - Create mail with .NET

DotNetOpenMail allows you to send email from applications which use Microsoft's .Net development framework, including asp.net, C# and WinForms. It is easy to create HTML and plain text email with file attachments without needing the System.Web.Mail library.

A programmer can use it to create multipart/alternative, multipart/related and multipart/mixed MIME messages in various character sets and various mime encodings such as quoted-printable, 7bit, 8bit and base64 without needing to know too much about the details.