GoDaddy Professional Email - GoDaddy Professional Email is a domain-based email service for businesses.
Yesmail - Yesmail provides email marketing solutions that integrate mobile, web, and social channels for marketers.
Thexyz - Secure premium email service with mobile sync apps for calendar, contacts, tasks, notes and FISMA compliant email archiving.
PostageApp - PostageApp is an email management service that makes it easy to design, deliver, and manage all of the email that websites or applications send.
ProtonMail - Secure email with absolutely no compromises. Get your free encrypted email account today.
SendGrid - Learn why more developers choose SendGrid for their email deliverability service to send transactional emails triggered by web apps. Get started for free