Radicale
Baïkal
SOGo
DAViCal
Roundcube
Xandikos
AgenDAV
Zimbra
Tutanota
ProtonMail
Gmail
Zoho Mail
Microsoft Outlook
Posteo
FastMail
mailbox.org
Tuta Mail is the secure email provider with automatic encryption built in. It focuses on security, privacy and open source. Tuta Mail is known as the best ProtonMail alternative as it is the largest encrypted email service in the European Union. German data protection laws which are even better than [Swiss privacy laws]({https://tuta.com/blog/swiss-privacy-is-an-illusion}) make Tuta a great contender in the field of secure communications.
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Great app for a free service. Standard security features. Hosted in Germany.
Based on our record, Tutanota seems to be a lot more popular than Radicale. While we know about 177 links to Tutanota, we've tracked only 15 mentions of Radicale. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Maybe https://radicale.org/ could fit the bill, CalDav for as a calendar server and CardDav for contacts. - Source: Hacker News / 12 months ago
I now use CalDAV Synchronizer to sync Outlook to my Radicale CalDAV / CardDAV "server" (a Raspberry Pi), with DAVx running on our phones. Source: about 1 year ago
Setup: 1. Install a CalDev server on my home server (running Debian Linux) using maybe Radicale (https://radicale.org/) 2. Use the Linux version of ProtonMail Bridge on this server to set up IMAP to connect to this CalDev server 3. Configure filters to automatically forward event invites sent to my ProtonMail address to my CalDev server, decrypted by Bridge 4. Configure my CalDev server to use ProtonMail to send... Source: over 1 year ago
Caldav is what you are looking for. The other comments mention implementations of them and I can vouch for radicale pretty barebones but does its job. Source: over 1 year ago
We are thinking of writing a guide to setting up a small Radicale instance. This could be hosted on a raspberry pi, or small NAS or something. Source: over 1 year ago
A look at tuta.com and tutanota.com demonstrates that Tuta is using an Amazon Start of Authority (SOA) DNS record and 4 corresponding Amazon Name Server (NS) DNS records. Source: 7 months ago
I've moved on to Ferdium by the way via the ferdium-electron AUR package. I also use Tuta, Skiff, Google Messages and YouTube Music with it. Source: 7 months ago
Unfortunately, since you launched the new tuta.com website, I can't access anymore from China, unless I have a VPN service. Source: 7 months ago
Have a non business paid account. Can you change your current tutanota.com email to the tuta.com email? Source: 7 months ago
Weeks ago when tutanota became tuta I had same issues...wouldnt allow me log in. I clicked links provided by tuta to "migrate" data...never worked. Few days later...i was able to log in at https://mail.tutanota.com/login and continued until today, when my credentials were not "valid" anymore so tried at tuta.com and same thing. Source: 7 months ago
Baïkal - Cal and CardDAV server
ProtonMail - Secure email with absolutely no compromises. Get your free encrypted email account today.
SOGo - SOGo is groupware server with a focus on scalability and open standards.
Gmail - Gmail is available across all your devices Android, iOS, and desktop devices. Sort, collaborate or call a friend without leaving your inbox.
DAViCal - DAViCal is a server for calendar sharing.
Zoho Mail - Zoho Mail is a secure, encrypted, and enterprise-ready email solution, a suite of apps tailor-made for your organization's needs.