how to send html email from shell script

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http://www.unix.com – This is my below script which is working fine as it send only plain text email. So My question is- How can I modify my below script to send this as an HTML formatted email? I want to show the text color of this expression `(echo "100*$TEST2/$TEST1" | bc -l)` as `RED` in an email and that can be done only in HTML formatted emails. So that is the reason I was thinking to send an email in HTML formatted way. Any suggestions will be of great help. Code: #!/bin/bash         TEN_DAYS="3793274 230667"         TEST1=`e (HowTos)