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djinncoyoteChanging the font sizes in the Thunderbird options affected the font size in HTML emails from certain senders, but not others.
In fact, when I selected larger font sizes and unselected the option "Allow Messages to use Other Fonts", it caused the font to become even SMALLER in certain emails.
The comments on this page give the solution:
https://bugzilla.mozilla.org/show_bug.cgi?id=1447408
In the "Advanced" Font settings, the "Fonts for" drop-down defaults to Latin. When Latin is selected, the other values listed on that page are applied to most incoming emails. But to fix the font sizes in the remaining emails, I had to select "Fonts for" = "Other Writing Systems", and update those settings too.
In fact, when I selected larger font sizes and unselected the option "Allow Messages to use Other Fonts", it caused the font to become even SMALLER in certain emails.
The comments on this page give the solution:
https://bugzilla.mozilla.org/show_bug.cgi?id=1447408
In the "Advanced" Font settings, the "Fonts for" drop-down defaults to Latin. When Latin is selected, the other values listed on that page are applied to most incoming emails. But to fix the font sizes in the remaining emails, I had to select "Fonts for" = "Other Writing Systems", and update those settings too.