Web Mail

Question

I have been using C# and .NET to send emails from my standalone applications. However those I have been using does not require authentication. How Can I send email via yahoo that requires authentication. With my company mail server I just use SmtpMail.SmtpServer ="pop.ttcl.co.tz"; For yahoo I will nedd something like this below SmtpMail.SmtpServer ="smtp.mail.yahoo.com"; But how about the username and password. If any body may help with this I will appreciate. [email protected]