We have a puzzle. mpd-net is one of the cancer support lists hosted at listserv.acor.org For the past several weeks, we have been receiving approximately 5 requests a day to subscribe to our listowners' mailbox from [log in to unmask], mpdinfo.org is the domain of the CMPD Education Foundation and our website for myeloproliferative disorders is at www.mpdinfo.org I looked up megawebservers.com and that site is supposedly an antispamming organization. I reported this to [log in to unmask] but just got a canned response. I've asked the ACOR postmaster if there is any way to block this spam from reaching us. No response. Is there anything we can do to stop this? So far this entity has only repeatedly sent "subscribe mpd-net" (no name). Any suggestions? Joyce Niblack