Thunderbird is my desktop email client of choice and one of the reasons for that is that it is highly customizable. Not only by installing extensions that change the client's behavior, but also by making changes to settings that the program ships with. I was recently asked if there is a way to increase the font size of the Ghacks newsletter in Thunderbird, and sure thing, there are several options to do so locally.
There are two ways to change the font size of emails in Thunderbird, one is only making the changes temporarily for the session while the other one is permanently making the change.
The easiest way to change the font size is to hold down the Ctrl key on the keyboard and use the mouse wheel to increase or decrease it. The changes are visible right away in the mail pane so that you can use this method to adjust the font size to a level you are comfortable with. You can alternatively use Ctrl and the minus or plus keys on the keyboard, or click on View > Zoom to use the menu to change the font size. The shortcut Ctrl and 0 resets the zoom level to the default value.
The changes that you make here are valid for the session which means that they are automatically reset on the next start of the email client.
If you have general issues reading emails because of the size they are displayed in, you may prefer a solution that changes the font size of emails permanently.
To do so click on Tools > Options in the menu. This opens the settings menu of the email program. Here you need to click on Display > Formatting to display all font related formatting options Thunderbird makes available.
Use the pulldown menus to change the default font size or font type, or click on the advanced button for detailed font formatting options.
Here you can modify the default font for proportional, serif, sans-serif and monospace contents, set a minimum font size and select a region you want your fonts be optimized for. The changes that you make in the menus here are permanent until you modify them again here.
You can still change the font size for individual sessions using the first method described in this post though.
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Ghacks is a technology news blog that was founded in 2005 by Martin Brinkmann. It has since then become one of the most popular tech news sites on the Internet with five authors and regular contributions from freelance writers.