15 April, 1999 Ottawa Canada My list doesn't use probing, either active or passive, but the periodic subscription request goes even to nomail subscribers, so if they don't issue a confirm they are eventually deleted. One problem with probing is it won't detect an abandoned address on a system which holds incoming mail in a master mail queue and quietly deletes mail which becomes stale dated so it doesn't fill up the available disk space. While this situation won't generate non-delivery errors, it bothers my sense of dignity to be sending mail indefinitely to an abandoned address, which is why I like a periodic subscription renewal. Brian