C# SMTP email sending code fails for Yahoo Mail but works fine for other servers, can anyone help?

Question

I am using this code to send an SMTP email via the yahoo SMTP server, it is for a personal project I am writing.

using System.Net.Mail;
using System.Net;

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Answer 1

Port 465 isn't supported by System.Net.Mail.SmtpClient.

http://msdn.microsoft.com/en-us/library/system.net.mail.smtpclient.enablessl.aspx

From the Remarks Section:

This connection method is sometimes called SMTP/SSL, SMTP over SSL, or SMTPS and by default uses port 465. This alternate connection method using SSL is not currently supported.

Edit: You could try using port 587 instead (if Yahoo supports it).