Mailing lists without Mailman, using only Tiki and ClearOS groups

We want https://doc.tiki.org/Forum-and-Mailing-List-Synchronization without installing Mailman

What needs to be developed, if anything?

Likely this needs to be restored: https://www.clearos.com/resources/documentation/clearos/content:en_us:5_mail_aliases

• Some ideas
  • Bounce management
  • Check for any desired features from http://www.sympa.org/overview/features
  • From Tiki forum, could be a hook to create email account.
  • Self-register to site, with username/email or email as username
  • Join Tiki group joins mailing list (This group is also synched with ClearOS)
  • Reply to list, or just to member who sent message?
  • Moderate messages depending on prefs / condition
    • Group membership
    • Size of message
  • POP mail account
    • Mails sent to this pop account are sent to all group members
    • Mails sent to the group have a "reply-to" to the list
    • Moderation feature should be kept (it's already a forum feature)
    • Any spam / virus filters on the POP account should work

See also: https://www.openhub.net/p/hyperkitty/