Yahoo changed it like one year ago or so and now when I start writing an email the font size is extremely tiny and I have to magnify the website in browser settings each time and it drives me crazy.
How to change the default font size of the emails on Yahoo Mail
yahoo-mail
Related Solutions
This is what I get with Windows 7 IE 11 preview - zoom 125% 1600x900 resolution.
Try changing the theme using the icon on the bottom left. The bold looks more obvious on some. This is light grey.
While replying, click on the arrow on the left of the “To” field;
From the drop-down menu, click on Edit Subject;
The Subject field will appear below the “To” field.
Best Answer
In the top right corner of yahoo mail hover over the gear, and select "settings" from the menu that appears. On the menu that loads from clicking "settings" you should select "Writing email" in the left column. Then you will see "default rich text format" and the second drop-down allows you to select the size. (Tiny, Small, Medium, Large, Extra Large, and Huge)