Folks,
In case it's of interest, here from NRL is a list of commercial e-mail products that have security.

Bill

>Mime-Version: 1.0
>Date: Fri, 12 Apr 1996 08:28:11 -0400
>To: wneugent@smiley.mitre.org
>From: jenket@itd.nrl.navy.mil (phyllis jenket)
>Subject: COTS products
>
...

>Public Key e-Mail Applications
>
>MailSafe
>Lotus cc:Mail Desktop for Windows (V.2.2)
>Lotus cc:Mail Mobile for Windows (V.2.2)
>Security Enabled Messaging (SEM)
>Zoomit RemoteLink Plus (V.2.3.2)
>Entrust/Client
>Entrust/Server and Entrust/Manager
>DSA Signature Software
>SecretAgent (Rel.3.X)
>ViaCrypt PGP (V.2.7.1)
>ViaCrypt PGP Mailers Add-In (V.2.7.1)
>ViaCrypt PGP/Token
>OmniGuard/SECURExchange (V.3.0)
>MailSafe (V.5.0)
>PEM-Elm
>Enterprise Xtended Mail Security & Encryption (EXM/ENTRUST)
>TIPEM (V.1.5)
>Sign n' Seal
>A400S Skipjack Modem
>
>PEM based applications
>Entrust/Client, Entrust/Server and Entrust/Manager
>PEM-Elm
>TIPEM (V.1.5)
>
>
>
>
>PJenket
>NRL Code 5544
>4555 Overlook Ave SW
>Washington, DC 20375-5337
>(202) 767-9048
>