Maybe the LISTSERV mailer (or LISTSERV DISTRIBUTE BACKBONE) host is "blocked"? This is NOT all that unusual, I'm sorry to say. /Pete Weiss formerly working for Penn State At 09:03 3/21/2006 Tuesday, Michael DeGregory wrote: >It seems the probes are failing on valid email addresses though and I can't >understand why. I did email tests to the addresses where the probe fails and >the emails get in fine. The changelog files say the individuals were auto >deleted due to probe failed error.