I attached what I have so far, you'll need to remove both Email.apk and Email.odex if you aren't deodex'd and you'll also need to be rooted. Drop this apk in /system/app and reboot, you'll have to setup the email again.
I believe the section I want is under WebView in the message_view_header.xml file.
I grabbed the deodex'd rom from Frostman, extracted it and decompiled the Email.apk to see how challenging it was to tweak it so it doesn't look like its made for a blind person. I have the sizes shrunk down for everything except the message body, I was wondering if anyone could give me a hand or point me in the right direction to do that. I know I can ping to shrink the text but I want the initial size to be smaller.