Z1 SecureMail Gateway is a central, server-based software solution that provides encryption and digital signatures (PGP and S/MIME) for the entire email traffic of an organization. It works with organizational certificates and certificates for individual users, groups, or organizational units. It provides its services transparently to end users. Z1 SecureMail Gateway automatically finds certificates of external users or companies via Internet. Secure email traffic to customers, suppliers, and partners is easily established. Evaluation packages for Debian and Solaris are available for download.