How to Change the Font for Incoming Mail in Thunderbird

You can choose a font that's easy to read

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It probably comes as no surprise that you can make changes to the font you use in outgoing emails in Mozilla Thunderbird. However, you can also set Thunderbird to use the font face and size you prefer when reading incoming mail—and you can pick your favorite color, too.

Change the Default Font Face and Color for Incoming Mail in Mozilla Thunderbird

To change the font used by default for reading incoming email in Mozilla Thunderbird:

  1. Select Tools Options... on a PC or Thunderbird > Preferences... on a Mac from the Thunderbird menu bar.
  2. Click the Display tab.
  3. Click the Colors... button and chose a new color to change the font or background color.
  4. Click OK to return to the Display window.
  5. Click the Advanced tab.
  6. Choose the drop-down menus next to Serif:, Sans-serif:, and Monospace to select the desired font face and size.
  7. In the menu next to Proportional: select either Sans Serif or Serif, depending on the font you want to use for incoming emails. This selection controls which of the fonts you selected is used in incoming messages. If you selected and want a sans serif font, make sure Proportional is set to sans serif to avoid spacing oddities.
  8. To override fonts specified in rich-text messages, place a check in front of Allow messages to use other fonts.
  9. Click OK and close the preferences window.

Note: Using your default fonts instead of those specified by the sender may distort the visual appeal of some messages.

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