MailChimp - MailChimp is the best way to design, send, and share email newsletters.
Lynis - Security auditing tool for systems running Linux, macOS, BSD, and other UNIX-based systems.
Brevo - Innovative online Email Marketing solution to manage your contacts, create & send your newsletters and track your results. More than 80 000 clients. Best prices and attractive features.
Lion - Accountability browser for the modern day
Campaign Monitor - Email marketing software built for designers and their clients to run successful email campaigns.
Silverback - Silverback 3