Groups.io
6.1#6 in mailing list management softwareFree planFree planAndroidiOSWeb
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You want what its maker publishes above — check its page for the details.
phpList suits community groups, charities, businesses, government departments, and other organizations that need to send email campaigns and manage segmented audiences. It is also a fit for users who want to self-host, provided they have suitable hosting and access to a working mail server.