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How to keep my composed emails in "Bold" font?-

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I can set the font and the color but can't make "Bold" the default.

I can set the font and the color but can't make "Bold" the default.

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Thunderbird does not provide a user interface for setting the default font and font size for the entire message. You can work around this by inserting code in an individual message, or you can add the code to an HTML signature file or a template.

See this article, scroll to the end for an example: