Starting at 1 am 10/23/06, yahoo.com began deferring all of the mail from our server (shamash.org[12.107.129.86])) with "Deferred: 421 Too many recipients" We reported this on 10/23/06 via phone and were told to email [log in to unmask], which we did. We still have not heard back from yahoo.com's postmaster. When we called, we were told that we could not speak to anyone in the NOC/Abuse/Postmaster staff unless we had the name of a "non-executive employee that worked in that department". A few questions for fellow ListServ site managers: 1) We have always sent out 50 messages per SMTP transaction. How many do you send out per message? 2) It seems as though yahoo put into place a new multiple-recipient policy. Do they publish these policy changes anywhere? (is there an email list we can join) Does any other site know what yahoo's current limit on RCPT in a single message? 3) Can someone mail me (not the list) the name (and/or email address) of some human in yahoo's Abuse/NOC/Postmaster department so I can reach someone? 4) Have you implemented Domain-Keys for ListServ? If so do you sign all of the mail which goes through ListServ, or only mail which originates from the server (administrative mail, digests, indexes) -- David Rosenthal, D.O. Shamash Coordinator http://shamash.org