>I've never had an error or bounce on these.. the probe is set to >6months, and the list itself is not even 6months old.. so it's not >from that I don't think. Actually, I think it is from the renewal probe -- I think that when you set it for a time interval (like 6 months) that it takes all the addresses and spreads them out over that interval, rather than renewing them all at once ... Sherry ------------------------------------------------------------------------- Sherry Beauchamp Social Science Research Network (SSRN) [log in to unmask] http://www.SSRN.Com Leading Social Science Research Delivered to Your Desktop Daily -------------------------------------------------------------------------