Why am I not able to send an email from command line

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http://askubuntu.com – This is what I did (as per a few discussions on this website) mail -s "hi" [email protected] < test.txt Where text.txt has the message. I checked to see if mail did exist and it does at /usr/bin/mail What am I missing? Is there a daemon that must be running? Is there more to this? I am running Ubuntu 11.10 (HowTos)