After about 5 bounces or whenever they post a "I am out of the office
until...," I set them to nomail status.
For international members whose systems might be down for weekends, I
tolerate a few days.

Then I send a note reminding them that they can set themselves to mail
status and nomail status in the future.
Craig
--
Craig Gjerde, PhD  [log in to unmask]  Univ of Wisconsin
Listowner of Family-L http://family.gws.uky.edu/FamL/Family-L.HTM