email2 is compatible with existing email structures. If you are using Microsoft Outlook, Exchange, or have a scanning process, archiving system, or any other perimeter defense in place, email2 will work alongside the existing structure to provide additional security and privacy.
The only difference is that email2 bypasses SMTP and instead uses a secure SSL connection for exchanging email2 messages, through the use of the Private Email Network (PEN) platform (acting as a gateway server). That's where the true value proposition resides: we don't replace or interfere with anything. Everything you currently have in place still works the same, including PKI, if you are already using email encryption (using email2 will cause your email client to exchange the encrypted message over SSL instead of SMTP!).
There are several advantages to this type of architecture, (e.g. accurate tracking, no size limit on attachments, etc.), which cannot be addressed by simple email encryption. And of course, the SSL transfer protocol is just as secure as any email encryption available on the market.
// Edited July 2008