To change colors in email, you go to sig box.
to get there---go to your mail list - click 'settings', then 'signature".
You'll see a box to write in.
The very first thing to write in the top left corner is
<<>body bgcolor="blue" text="white">
You can change the colors to whatever you want but keep the spacing (theres a space before text) and the quotation marks just as they are.
Then write <<>/html> - notice the slash in this one.
Html is an EXACT computer language and will not work if a space is leftout or added, or a punctuation mark missing.