Many older Tamil fonts (like TSCII or Bamini) are non-Unicode . This means they use a custom encoding system. If you send a document typed in a non-Unicode font to a friend who doesn't have that exact font installed, they will see gibberish or boxes.
of font, such as a traditional typewriter look or a modern bold headline font? Sangam MN Latin in use - Fonts In Use apt sangam tamil fonts free