Mail configuration in AIX

If the CPU exceeds the certain limit, there is an option to send mail to specified user. I'm working on that and I get the following error.

echo "hi" |sendmail -v vinoth.9@tcs.com
WARNING: local host name (aix01) is not qualified; see cf/README: WHO AM I?
/dead.letter... Saved message in /dead.letter

Please help to resolve this issue. Thanks in Advance
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