sending an e-mail

[Nancy Crisostomo Martinez]

Hi  everybody!
I'm having some troubles with sending an e-mail from a servlet I have
running on Tomcat 3.3 and Solaris.

I have a servlet which use Java Mail API to send an e-mail, but when I
press the button to send an e-mail  this error appear on console:

          javax.mail.NoSuchProviderException: No provider for
          Address type: rfc822

Could you tell me why does this message appear? and How can I fix it?
Thank you in advance!!
Nancy.