Here's how I feel:

When you're living your life for God, your love for Him should show through your daily actions. That does not mean sending an email. Emails are temporary. Your love for God shouldn't be. I feel the Lord knows your heart. Whether you send the email or not doesn't automatically show others that your love God or that you're not ashamed of him. I don't feel anyone has anything to prove to anybody. All things are judged by God. He has the final say. He knows all and sees all.

You shouldn't feel obligated to send those emails at all. Just let your light shine in front of others. They'll get the message and God already knows what's up.