sending mail on ubuntu through sendmail

[Stephen S. Disbrow]

Hi,
    how do I configure sendmail so that I can use sendmail to actually send mail.
my ubuntu 10.10 host's static IP is  192.168.1.20, and it's on a router connected to a cable modem. I think my cable company will only allow smtp mail to go through one of there servers smtp.charter.net. How do I configure my machine to allow programs to send mail via the sendmail deamon to the outside internet world?I know I'm supposed to modify items in sendmail.mc and than do a make in /etc/mail , and restart sendmail via init.d, but I'm not sure what I should be modifying

Steve D. (hopelessly lost.)
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