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Roundcube - Web-based IMAP email client
Polymail - Native email app for email productivity.
HEY - Email at its best, new from Basecamp.
Canary Mail - Privacy-aware email app for Mac & iOS
Mailo - Mailo is an email client where you can send and receive emails to and from anyone with an email address.
Airmail - Airmail is a lightweight and lightning fast mail client for Mac.