Mail utility not displaying escape sequences

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http://www.unix.com – Hello! I created a file that displays text underlined. However when I pass the file into the mail utility it doesnt display the underline. Here is the code: echo "\n\033[4mUsername Timestamp Terminal\033[0m" > test_underline.txt cat test_underline.txt mail -s "testing of underline" <email_address> < test_underline.txt Any ideas? Thanks! (HowTos)