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A project written in C# sends email without defining a smtp server. It queries dns servers for the MaileXchange records and sends them directly, so, there is no need to define a smtp server. It supports complete SMTP and SSL protocols.
This is an email server written in C#. The server handles protocol, and a plugin architecture allows developers to create their own authentication/mail storage system, making this one of the most scalable email servers in the world. 2 plugins included.
Simple multi-threaded replacement for System.web.mail. Its is fast/stable because it only implements 1 smtp method - (200+ msg/sec P4-3GHZ). It is mainly designed for message injection to another SMTP server for end delivery. Written in 100% managed C#.
OpenSmtp.net is an open source SMTP component written in C#. It does not rely on the .Net Framework System.Web.Mail classes. It also has a web service that allows the sending of email via HTTP.