phpList : phpList is an open-source newsletter manager.
phpList

phpList Screenshot
Overview
phpList is an open-source newsletter manager. phplist is free to download, install and use, and is easy to integrate with any website. phplist is downloaded more than 10000 times per month.

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Features

  • double opt-in subscription mechanism
  • scheduling
  • RSS
  • list segmentation
  • click-tracking
  • attachments
  • bounce management