A couple of quick questions

Using the embed code from a custom field, I'm trying to create a clickable link for an email. I thought the following might work, but it creates a link instead of the email address that was added.

Main Contact:</b> <a href="<?php echo do_shortcode('[ct id="_ct_text_4fb7d85fa1277"]'); ?>"><?php echo do_shortcode('[ct id="_ct_text_4fb7d85fa1277"]'); ?></a>

The custom field holds an email address.

Also, how would I code this to only show up when there is information in the custom field?

Thanks.