MailMate - MailMate is an alternative email client that was designed for the macOS.
eclipso Mail Europe - Privacy first. Your Email. Your Cloud. Your Office. Simplify your life with eclipso, the safe & central place to organize and share your emails, photos, files, contacts, calendar events and more.
Mailspring - Mailspring is a mail client for Mac, Windows and Linux.
Inbox.lv - Inbox.lv Mail
Airmail - Airmail is a lightweight and lightning fast mail client for Mac.
CounterMail - Countermail is a web-based email service. It is hosted in Sweden. Its focus is on privacy.