SMTP protocol AUTH=LOGIN authentication

This week, I learned about a new SMTP (Simple Mail Transfer Protocol) authentication method: AUTH=LOGIN (or AUTH LOGIN). I found out that this authentication extension is pretty simple (it uses Base64 for "encryption"), but even so, I could find official specifications of this authentication method.

Also, I noticed that .NET's SmtpClient class from System.Net namespace doesn't seem to support this authentication method. So if you run into this authentication method and are required to use it, you might neet write your own SMTP client, purchase a component, or dig the open source libraries to see if they support what you need.

Good luck!