No. When you send an encrypted e-mail, the recipient receives an HTML attachment containing your secure message. When they open it in their Web browser, they will be able to decrypt and see your e-mail through a secure connection. It's that easy!
If, however, they wish to see their secure mail in their own Outlook or Outlook Express e-mail client, they are welcome to create an AppRiver CipherPost Pro® account and install the AppRiver CipherPost Pro plug-in.