S/MIME encryption is free to UMKC users, but requires configuration ahead of time. This may require a cost on the recipients part if they are not already setup for S/MIME encryption.
S/MIME requires 3 parts to complete:
Obtain a Certificate
Outlook 2010 Instructions
Outlook Web Access Instructions
Information on how to setup Outlook Web Acces for S/MIME (Only do this on secure personal computers you own and manage)
Note that for Outlook Web Access, you must use Outlook 2010 or Outlook 2010 to import your recipients public key.
iOS 5 (iPhone, iPad, iPod Touch) Instructions