Google Groups is not available as a self-hosted solution but there are a few alternatives for power users and business that want to host a solution on-premise. The best open source Self-Hosted alternative is Mailman. If that doesn't suit you, our users have ranked more than 25 alternatives to Google Groups and three of them are open source and available as a self-hosted solution so hopefully you can find a suitable replacement. Other interesting open source Self-Hosted alternatives to Google Groups are Mailing Group - Listserv and GroupServer.
Mailman is integrated with the web, making it easy for users to manage their accounts and for list owners to administer their lists. Mailman supports built-in archiving, automatic bounce processing.
Allows you to run a free Listserv or email group right from your WordPress dashboard. Its the best two-way communication group email plugin in wordpress where an email sent to the main group email gets forwarded to the all group members.
Email lists, with an integrated web interface, and control. Administering large mailing list sites
Are you sick of the limitations of open source MLMs, but not ready to give up control to a web-delivered service? Give your users a web interface
Let your users read and post mess.
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No hosted version from supplier