Having a large screen, I looked forward to having more screenspace to view e-mails. Unfortunately there's some dumb margins in the ICS email app, so I've gone ahead and edited them out. Just replace the Email.apk in your /system/app/ folder with the one linked below and you'll be set. For people using modified Email.apk (I'm not too aware of any) and you want to keep your mods and get my layout (also in cases where the app might not be compatible with your ROM), try overwriting /res/layout/message_compose.xml and /res/layout/mailbox_list_fragment.xml from my Email.apk to yours.
Note: This was done on 4.0.3, I dunno if it works fine for you individuals still on 4.0.2.
Edited by CrushD, 22 January 2012 - 08:10 PM.