MailStore - MailStore Home - A 100% free single-private-user desktop solution
docNCRYPT - docNCRYPT is a cybersecurity platform which only focuses on its core services in protecting your email directly from the different email service provider and allows you to integrate your business email portal in the online service.
SysTools Gmail Backup - Backup Gmail Emails, Contacts, Calendar, and Google Drive Storage File by SysTools Gmail Backup Solution
LuxSci - LuxSci providing HIPAA-compliant email, secure email & web services.
Gmvault - Backup the emails in your Gmail account.
encryptomatic - encryptomatic is a smart email encryption software which provides tons of tools in encryption protocols for secure communication and business transaction.