Encipher.it - Encrypting email with Encipher.it is a simple way to protect your sensitive data.
MailChimp - MailChimp is the best way to design, send, and share email newsletters.
Lockbin - Lockbin is a web application for sending private email messages and files.
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.
secserv.me - Create client-side encrypted message. Chat anonymously client-side encrypted.
Campaign Monitor - Email marketing software built for designers and their clients to run successful email campaigns.