At Microsoft there is a stage of the development called ZBB or "zero bug bounce." ZBB basically means that the software teams have taken care of all their open bugs for the current milestone and are ready to transition to the next milestone. ZBB is a cause of much celebrating on the part of the teams since it can be a hard drive to hit the ZBB dates.
For marketing, I suggest the creation of "ZEB" or "zero email bounce." ZEB would be the phase of a marketing person's week (or month) when we managed to clear out our inboxes. Based on a random survey of marketing people, I'd estimate that we'd have one ZEB per marketing employee every two years.