Penango

<p>Penango gives you standards-based (S/MIME) authenticated and end-to-end encrypted e-mail in your Gmail, Google Apps, and Zimbra without gateways.</p><p>Penango is a team of people dedicated to improving the security and experience of online communication for businesses, organizations, and users all over the world. We devote our energies and expertise into creating and developing security solutions for every enterprise and individual, and working with our partners to provide secure messaging that works.</p>