Mu4e - Starting with version 0.9.8, mu provides an emacs-based e-mail client which uses mu as its back-end: mu4e.

Deep Instinct - Deep Instinct is revolutionizing cyber security, offering advanced cyber security solutions that harness the power of deep learning analytics with unprecedented deep machine learning and AI prediction models.

Mutt - Mutt is a small but very powerful text-based mail client for Unix operating systems.

Quarkslab - Quarkslab is a security platform that makes applications and data safe with its skilled vulnerability search tools and design of security solutions.

Mailspring - Mailspring is a mail client for Mac, Windows and Linux.

Shape Security - Shape Security is a cyber security solution to defend websites against attacks from malware, botnets, and scripts.