MailStore - MailStore Home - A 100% free single-private-user desktop solution
NeoCertified Secure Email - NeoCertified is a solution that provides secure email encryption for businesses and organizations across all industries, including healthcare, finance, legal, non-profit and education.
MailSteward - MailSteward : The Ultimate E-mail Manager for Mac OS X
Virtru - Virtru is your data privacy force field, wrapping and protecting emails and files wherever they're shared. Easy-to-use data security software for business. People also askIs Virtru Hipaa compliant?
Gmvault - Backup the emails in your Gmail account.
Encyro - Use Encyro to send sensitive messages and files to your customers and service providers, including accountants, loan officers, health coaches, and others. Stay organized and forward documents from your mobile device.