So I've got this working with Hotmail and Gmail, no problem. With Yahoo, though, it gets an error. I've searched already and haven't found my answer. I'm hoping someone could come here and help me figure this out.
Here's the code :
Dim smtp As New SmtpClient
        Dim mail As New MailMessage
        smtp.Credentials = New Net.NetworkCredential("Username@yahoo.com", "password")
        smtp.Port = 465
        smtp.Host = "smtp.mail.yahoo.com"
        smtp.EnableSsl = True
        mail.Subject = "test"
        mail.Body = "test"
        mail.To.Add("Username@yahoo.com")
        mail.From = New MailAddress("Username@yahoo.com")
        smtp.Send(mail)

I don't see what's wrong with it, and the error I'm getting is : Failure sending mail.