Forum OpenACS Development: Oracle 10g Portal Self Registration Feature

Hello,
I am trying to make the E_MAIL portion from Oracle 10g Portal Self-Registration feature to work.
I have specified the IP for the E-Mail (SMTP) Host and used port 25. However, when users register, no e-mail is generated. In the same way, when an account is approved, the user does not receive an email confirmation.
The SMTP host is valid.
What account does portal use to send e-mails from. Where can I edit this information?

Help
I am new to Oracle.....