proton mail

AI meets e-mail.

Removes duplicate messages from the current view in Mail.

Get your customers, mail, calendar, tasks, etc., in one central database.

Quoting headers like Outlook and signatures in Mail.app.

Powerful and secure Internet mail server.

Enables bottom-posting for Mail messages.

Speaking email checker for Apple Mail.

Faster Mail.app spell checker.

Notification plugin for Mail.app.

Adds a follow up item to emails and contextual menus in Apple Mail.