The apparent default font for e-mail on my iMac is Helvetica 10, which is perfectly fine. However, the apparent font size is far smaller on my 2009 Intel iMac presently running Mac OSX v.10.7.5. I can't read it when composing a message--but when I increase the font size to something I can see (e.g., 18), I can then read it but it appears idiotically large to my recipients.
Is there a way to permanently change the apparent font size on my iMac monitor to match my viewing preference when composing--I didn't buy this enormous screen for no reason--without actually changing the font size my recipients actually get? I (think) I know about "Command" and "+/-" to change any particular message, but it seems odd I can't make the default font appear larger.