Alternative to Google groups

Hello there,
searching for a free or minimal charge option for an alternative to google groups.
Specs:
-Group consists of about 25 people
-Minimal fee or free
-People must be able to use their own email addr.

  • Use: Exchange of emails mainly and occasional docs.
    Very often google groups won’t allow someone to join the group and since there is no tech support can’t figure it out.
    Thanks,
    Al

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