This likely caused by the "passive" probe which is sent to a fraction of the subscribership with each posting. If you don't want the passive probe, you can add ",Probe(0)" at the end of your Auto-delete line. If you don't want a particular user probed, you can SET them NORENEW. The passive probes are used for cleaning out users with mail servers that use non-standard bounces (that go to the right address, of course -- there's nothing that LISTSERV can do about servers that send bounces to the wrong address). You will probably have noticed that you are no longer getting the non-standard bounces. Note that passive probes are only available in 1.8d. If you are worried that one of the people who failed a probe shouldn't get deleted, send them some e-mail and see if your mail to them bounces, and if so for what reason. Francoise