How often do you see an email address like this?
What are they thinking! Now try this -
This may be an absurd example but it illustrates the point. Cards are distributed to exchange contact information. If the artwork, type styles and other design elements make that difficult they should be changed. Specifically email addresses ARE NOT CASE SENSITIVE - EVER. Once more - email addresses ARE NOT CASE SENSITIVE - EVER.
Ask someone you trust to tell you whether your business cards are readable - without a magnifying glass and without several guesses as to whether that is a "1" or an "l". If that last phrase doesn't make the point, I don't know what would.