I've tried from 4-5 different mail providers to send something to abuse@uky.edu. Can't figure out what's wrong, as I've never seen AuthRequired anywhere before. Every single one of them has gotten the reply of: *Delivery has failed to these recipients or distribution lists:* abuselist@email.uky.edu <mailto:abuselist@email.uky.edu> Your message wasn't delivered because of security policies. Microsoft Exchange will not try to redeliver this message for you. Please provide the following diagnostic text to your system administrator. ------------------------------------------------------------------------ Sent by Microsoft Exchange Server 2007 Generating server: ad.uky.edu <http://ad.uky.edu> abuselist@email.uky.edu <mailto:abuselist@email.uky.edu> #550 5.7.1 RESOLVER.RST.AuthRequired; authentication required ##rfc822;dl_abuselist@email.uky.edu <mailto:rfc822%3Bdl_abuselist@email.uky.edu> _______________________________________________ NANOG mailing list NANOG@nanog.org http://mailman.nanog.org/mailman/listinfo/nanog