Paul Russell wrote the following on 4/10/2007 5:12 PM:

> Configure your list to use passive probes with a 1-day interval.
> 
> 	*  Auto-Delete= Yes,...,Probe(1)
> 
> On any given day, the first message posted to the list will be sent as a
> passive probe to every non-NOMAIL, non-DIGEST, non-INDEX subscriber. 

Actually, unless there has been a change in Listserv 15.0, there is no 
way to get the probe out every day. Probe(1) sends it out every other 
day. But if someone is junking all posts rather than unsubbing, or they 
happen to junk that one post, you can catch them.

-- 
Karen Reznek
head listowner -- Asperger
Director -- ICORS