If you would like to change the size of text in HTML mails/websites but are unable due to fixed font sizes within the style sheets used, this little trick may help if viewing the file in Internet Explorer:
Open Internet Explorer, click Tools, Internet Options then go to Accessibility on the General tab
Check "Ignore font sizes specified on Web pages" and click OK
When you refresh the page you are on you can use Ctrl + Scroll Mousewheel (or View, Text Size) to change the size of the font.
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