Poste.io Alternatives

An open source mailserver suite.

Open Source

Mail-in-a-Box provides webmail and an IMAP/SMTP server for use with mobile devices and desktop mail software and also includes contacts and calendar synchronization.

Open Source

Warm up your cold email inbox, and never land in spam anymore!

Try for free freemium $9.0 / Monthly

Mailu is a simple yet full-featured mail server as a set of Docker images.

Modoboa is a mail hosting and management platform including a modern and simplified Web User Interface.

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

Open Source

Self hosted modern mail server

Open Source

Eudora Internet Mail Server is a highly advanced internet mail system that supports the all kind of email systems and clients either it is IMAP, POP3, SMTP and much more.

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.

Simple, easy and secure mail server with a convenient and simple interface.

Web-based IMAP email client

Open Source

Open-Xchange Server 6 is the most advanced Linux based Groupware solution f.

Email Marketing for Business Checkout a smart email marketing software that helps you grow your business & reach out to new customers.

Axigen is an integrated email, calendaring & collaboration platform, built on a Linux mail server technology.