For a brief period (two hours or less) earlier today (Tuesday, 26 November), the outbound electronic mail process on one of the central systems (Rose.MUOhio.Edu, a/k/a MailFwd.MUOhio.Edu) was misconfigured *not* to use Mail Exchanger (MX) records in delivering outbound e-mail. MX records help resolve host.domain name aliases to the names of actual host systems capable of receiving e-mail. For the period of time that Rose / MailFwd was misconfigured, outbound e-mail to several MX'd host.domains (notably including America Online, aol.com) was returned to sender with an error message reading "550 Host unknown." The problem was quickly recognized and corrected by MCIS Technical Support. Anyone whose outbound e-mail was returned to them with a "550 Host unknown" error message, should simply re-send their mail messages, which should now deliver properly. MCIS regrets any inconvenience this problem caused. -- Miami University John B Harlan Campus Wide Information Systems (CWIS) Coordinator Miami Computing & Information Services (MCIS) Client Services 137 Hoyt Hall Oxford, Ohio 45056-1618 (513) 529-5330 voice (513) 529-5058 fax [log in to unmask] http://miavx1.muohio.edu/~harlanjb/