Please excuse me if this is off topic; if so, I would appreciate a pointer to the correct list. We've received a few thousand late this afternoon of email messages similar to the below. What do you make of this? Is there a defense other than blocking the alleged IP range? Your opinion appreciated. Larry ----- Aug 4 18:50:06 mail sendmail[29805]: SAA29805: <_-MetHOd-MaN-_@mail.texoma.net>... User unknown Aug 4 18:50:06 mail sendmail[29805]: SAA29805: from=<>, size=0, class=0, pri=0, nrcpts=0, proto=SMTP, relay=upsmot02.msn.com [204.95.110.79] Aug 4 18:50:07 mail sendmail[29786]: SAA29786: <_-MetHOd-MaN-_@mail.texoma.net>... User unknown Aug 4 18:50:07 mail sendmail[29786]: SAA29786: from=<>, size=0, class=0, pri=0, nrcpts=0, proto=SMTP, relay=upsmot03.msn.com [204.95.110.85] Aug 4 18:50:09 mail sendmail[29810]: SAA29810: <_-MetHOd-MaN-_@mail.texoma.net>... User unknown Aug 4 18:50:09 mail sendmail[29810]: SAA29810: from=<>, size=0, class=0, pri=0, nrcpts=0, proto=SMTP, relay=upsmot02.msn.com [204.95.110.79]