Font size on printed copis different than shown on incoming email

What font are you referring to? Have you prepared a document in a word processing program, or added text to an image file, and are disappointed because you want to see the text printed larger? If so, your best solution is to edit the document or image and change to a larger text size. For example, most text documents will normally default to either a size 10 or 11 text which is readable but small. Changing to size 12 or 14 will make the text look larger onscreen, and the text will also print larger. The font name and font size should be displayed on one of your processing program's toolbars, and is easily changed to a different font name or size. If you are simply copying an already printed document and want the text to appear larger, you should refer to your printer's User Guide. If you don't have the User Guide, you can download a free copy at this link:
HP PSC 1510 All in One Printer User guides

You can try a work-around it by copying the text into another program like Word or WordPad, adjusting the fonts and then printing.

If you are trying to print emails directly, you must change font size in Internet Explorer options for font size which controls email print size in Outlook Express. You may copy to a Word doc to control fonts there.

You can only change the font in the software that you are making your documents with or with your email try changing the font type and size. This is the only way to adjust the size of your font.

RE INSTALL YOUR DRIVER FOR YOUR PRINTER . IT WILL HELP YOU ..

That is at times controlled be the size selected in Windows Internet Explorer font options, which also effects Outlook Express email printing. You may copy and paste to a word document and change font sizes there also.

The manual doesn't list scaleable font size as a feature. You will probably have to set your font size in the document you are making.

Your font should be set to a bigger size on the screen. What email software are you using? Is it web based?

According to Yahoo's Answers page, another Yahoo email customer had the same problem, and resolved it by clicking on "View" on the browser toolbar, then "Text Size" and selected a larger size ("Increase" on the Firefox browser).

Font sizes are a program thing nothing to do with the printer
 Examine your E-mail client set up in the read section[Different E-mail programs different setting ] probably under a heading
Tools/Options and look at how the font sizes are organized.