This module looks promising but suprisingly it doesn't have CC, BCC and Attachments which are common features in emailing. Without the said, this module is not usable at this point of time.
I used Rules module extensively in D7 but sadly the creator seems to have left Drupal leaving all his modules stuck in further development
Needs review
3.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.