Sending email from a servlet - authentication problem

Hi, I'm trying to send an email from a java servlet, using JavaMail.  I dont know anything about SMTP but I'm trying to use my yahoo account as the from address and as the smtp server but I'm getting the following error:

javax.servlet.ServletException: Sending failed;
  nested exception is:
      class javax.mail.AuthenticationFailedException

Can anybody help me with this?
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most probably yahoo has a mechanism to  block the outsiders to use their mail server............... this can either be setting up a password or security certificate for their mail servers that's why you are getting the AuthenticationFailedException error.............  

also, the protocol of yahoo doesn't allow/use smtp....i think they are using imap



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