** Changed in: mahara
    Milestone: 18.04.0 => 18.10.0

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  A cron task to periodically clear the VERP bounce counts

Status in Mahara:

Bug description:
  Mahara has a VERP system to disable email addresses that have been
  bouncing. "Bounces_min" and "Bounces_ratio", and it disables an email
  when it has received more than "bounces_min" bounces and the ratio of
  bounced messages to all messages sent is greater than bounces_ratio.

  The thing is, these are *lifetime* numbers, and never get reset. This
  poses some difficulties once a site has been around for a few years,
  like mahara.org. We have some email addresses that have received
  thousands of messages. So, if we set bounces_threshold to something
  like the default "0.2" setting, then if one of those longtime
  addresses become invalid, we would continue to send hundreds of
  messages to it before we got around to disabling it. On the other
  hand, if we set bounces_threshold to 0, then we have the problem that
  the bounce count is cumulative and never gets reset. So, if we leave
  it at the default 5 emails, I could get disabled due to one bounce
  every three months over the course of a year and a half.

  Really, whether to disable someone's email should be based on how much
  it has been bouncing *recently*. So what we should do is add a cron
  task which sets the artefact_internal_profile_email.maillsent and
  artefact_internal_profile_email.bouncecount columns back to 0

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