This section of the manual discourages the Full-Auto setting. We have used
this setting on our lists for years and there has never been any problem.
Why this warning? As far as I can tell accounts exceeding disk quota get
deleted just like any others.

- When running in full-auto mode, LISTSERV never passes back a delivery
  error unless it took action on it. This means that certain errors may
  remain unsolved, as LISTSERV presently ignores temporary errors and some
  of them are virtually permanent (if the owner of the account has left but
  for some reason his account was not closed, his disk quota is bound to
  remain exceeded until someone takes action). Full-auto mode should be
  used only when the list owner positively does not have the time to handle
  the delivery errors LISTSERV sends every day.