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In order to send an email using UTL_SMTP, you MUST have a valid SMTP Host . Typically, the SMTP host is your company email server. However, if you are not on a network, you should be able to use a public Email server so long as the public email server allows remote connections. There is a thread that discusses using "gmail.com" as the SMTP host, but the author of the thread was never able to make it work. I have used my College email server successfully but I had to log into the email server using my user account and password. If you can use an email client, such as Outlook Express, to send and receive email, you should be able to use UTL_SMTP to send and receive email from that email server.
Hope this helps.