The messages are managed in the standard MH format, which features fast access and data security. You'll be able to import your emails from almost any other email client, and export them just as easily.
-Graceful, and sophisticated interface
-Easy configuration, intuitive operation
-Robustness and stability
Installation into Linux Mint:
sudo apt-get install claws-mail
sudo add-apt-repository ppa:claws-mail/ppa sudo apt-get update sudo apt-get install claws-mail