GoDaddy Professional Email - GoDaddy Professional Email is a domain-based email service for businesses.
Thexyz - Secure premium email service with mobile sync apps for calendar, contacts, tasks, notes and FISMA compliant email archiving.
ZixArchive - ZixArchive is a cloud-based solution to collect, store and search archived emails.
ProtonMail - Secure email with absolutely no compromises. Get your free encrypted email account today.
Cryoserver - Cryoserver is an all-in-one email archiving solution that empowers you to preserve your email in a tamper-evident archive, making you transform your data into a useful archive for everyday use.
mailbox.org - mailbox.org offers a secure e-mail account for home and business use. The domain name, me@mailbox.