Secure (encrypted) and private (doesn't data mine or read users emails) email alternative to Gmail, Outlook, Yahoo, etc. Offers not only email support, but you store contacts, calendar events, and tasks through Exchange, IMAP, POP, etc.
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SwisMail Alternatives
SwisMail is described as 'Secure Free EMail Service Hosted in Switzerland' and is a Mail Server in the online services category. There are more than 25 alternatives to SwisMail for a variety of platforms, including Web-based, Android, iPhone, iPad and Windows apps. The best SwisMail alternative is Proton Mail, which is both free and Open Source. Other great apps like SwisMail are Gmail, Tuta Mail, Disroot and Zoho Mail.