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If you have a Yahoo! account, you can change the appearance of your messages.
For example, you can change font color or size.
If the default font size for Yahoo! is too small or too large, there are two ways to change the font size.
You can change the font size while composing a message or you can change your settings and change the font size for all messages.
Click "New" to compose a message and click "Rich Text" beside the "Subject" line to show font options.
The appearance bar will open in your e-mail message; you can change font color and size here.
Highlight the text you want to change the font size.
Change Font Size in a Yahoo! Mail Message
Look to the font options toolbar above the e-mail message and click the arrow beside "12," the default font size.
A drop-down list will open with the available font sizes.
Select a different font size from the drop-down list.
The font size of the selected text will change.
Change Font Size Permanently in Yahoo! Mail
Sign in to your Yahoo! Mail account and click "Options" located at the top, right corner of the window.
Select "More Options" from the drop-down list.
The Options page will open.
You can change your signature or message settings here. Select "General" from the list of options and look to the section marked "Plain text font."
Click the arrow beside "12," the default font size and select a different font size from the drop-down list.
Click "Save Changes" to save the new font size.
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