Horde Alternatives

Web-based IMAP email client

Open Source

Email at its best, new from Basecamp.

paid Free Trial $99.0 / Annually

VoIPstudio is an award-winning VoIP system that offers businesses of all sizes a scalable communication solution. It’s inexpensive, easy-to-use, offers a full suite of PBX features, and is fully integrated for CRM.

Try for free paid Free Trial $4.99 / Monthly (User)

Mailo is an email client where you can send and receive emails to and from anyone with an email address.

Mailpile is a modern, fast web-mail client with user-friendly encryption and privacy features.

Open Source

Disposable email address application.

RainLoop is a web based email client.

Open Source

All your E-mail, from all your accounts, in one place. Cypht is like a news reader, but for E-mail.

Open Source

Save time and scale faster with accessible, secure, and reliable cloud email services. A proven multitenant email solution for telcos and service providers.

freemium $1.3 / Monthly (Per mailbox)

Soverin is the honest email service that doesn’t sell your data.

Zimbra is trusted by over 500 million users to increase productivity with a complete set of collaboration tools while maintaining total control over security and privacy.

Webmail service. Powered by RainLoop.

A fully fledged, free email server solution, an open source project (GPL v2).

Open Source

Self-hosted server for the ProtonMail client.