Horde Alternatives

Web-based IMAP email client

Open Source

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

The #1 email warming service to improve your deliverability by generating realistic and meaningful engagement to your emails. Easy-to-use solution to help you land in the main inbox instead of the spam folder.

Visit website paid $19.5 / Monthly (Pro)

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

Open Source

Email at its best, new from Basecamp.

paid Free Trial $99.0 / Annually

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

Disposable email address application.

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.

Webmail service. Powered by RainLoop.

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.

Open Source WebMail Lite is a free community edition of full-featured WebMail Pro server applicatio...

Self-hosted server for the ProtonMail client.