What are some alternatives?
Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
ProtonMail - Secure email with absolutely no compromises. Get your free encrypted email account today.
Gmail - Gmail is a free search-based web-mail service.
Tutanota - Get your encrypted mailbox for free.
Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Airmail - Airmail is a lightweight and lightning fast mail client for Mac.