Alternatives to Horde for all platforms with any license

Gmail

Gmail is a free search-based web-mail service. It offers a full featured web-based email client with search capabilities, a mailbox with Pop and IMAP access, SPAM...

Free Web Android iPhone Chrome OS Android Tablet ... iPad Chrome Android Wear Android TV Software as a Service (SaaS)
Basic html mode Custom Backgrounds Integrated Chat Integrated Search ... Outlook integration Canned responses Multiple Account support Works Offline Emoji Text support Mail filtering Threaded Conversations IFTTT integration Support for IMAP Integrated Spam Protection Email Server Organize mails Suggested replies Unified inbox Web-Based Yahoo Integration Add a feature

3121 Like
Roundcube

Roundcube webmail is a browser-based multilingual IMAP client with an application-like user interface. It provides full functionality you expect from an e-mail client...

Free Open Source Self-Hosted PHP Cloudron
Hostable PGP Encryption Add a feature

146 Like
Zoho Mail

Zoho Mail is a webmail service built with the needs of a modern business in mind. It provides features for business users to communicate effectively while catering to...

Freemium $ $ $ Mac Windows Linux Web Android ... iPhone
Custom domain Ad-free Virtual office Document sharing ... Integrated Spam Protection Mail filtering POP3 Support Privacy focused SMTP integration Two factor authentication Add a feature

93 Like
Rainloop

Simple, modern & fast web-based email client. Modest system requirements, decent performance, simple installation and upgrade, no database required. All these make...

Free Open Source Web Self-Hosted Nextcloud JavaScript PHP ... Cloudron
Dockerized Encrypted Email Email Server Add a feature

51 Like
Mailpile

Mailpile is a modern, fast web-mail client with user-friendly encryption and privacy features. The development of Mailpile is funded by a large community of backers and...

Free Open Source Linux Web Self-Hosted OpenPGP
Encrypted Email OpenPGP POP3 Support Web-Based Add a feature

113 Like
Vivaldi Mail

Free email service with no ads and no strings attached. Also contacts and calendar features.

Free Web
Support for IMAP Encrypted VPN POP3 Support Encrypted Email ... Mail filtering PGP Encryption Web-Based Add a feature

20 Like
mailcow: dockerized

mailcow is a mail server suite based on Dovecot, Postfix, SOGo, Rspamd and other open source software, that provides a modern Web UI for administration.

Free Open Source Linux
Email Server ActiveSync Modular System Self hosted mail ... Support for Docker Email Server Add a feature

32 Like
Mailo

A mail service which meets all needs - For individuals: free or Premium (1€/month) Mailo accounts - For children: a free and 100% secure address with a recreational...

Freemium $ $ $ Web Android iPhone Android Tablet iPad ... OpenPGP
CalDAV CardDAV Cloud Storage Cloud sync ... Sync Contacts Family Calendar Integrated Compliance Suite Privacy Protected Calendar Sync ActiveSync Bookmarking Bookmarks Calendar Gpg encryption Support for IMAP PGP Encryption POP3 Support Privacy focused Ssl Virtual disk Support for WebDAV Add a feature

10 Like
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HEY

Hey is a new hosted email service launched by the makers of Basecamp , which aims to organize your email inbox. Since they don’t sell...

Commercial $ $ $ Mac Windows Linux Web Android ... iPhone Windows S Android Tablet iPad
Ad-free Integrated Spam Protection Privacy focused Large File Transfer ... Send later Threaded Conversations Add a feature

6 Like
Zimbra Collaboration Suite

Zimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more. With the most innovative web application available today, Zimbra...
- Similar scope of groupware functionality, including calendar, tasks, etc. sondrak • Mar 2019
Freemium Open Source Linux Web Self-Hosted
Active Directory integration ActiveSync Calendar Email Server ... Real time collaboration Team Collaboration Add a feature

30 Like