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Many of my users are reporting SMTP errors when sending from mail.msu.edu: ----- sent FROM yyyyyyy There was an error sending your message: Failed to add recipient: [log in to unmask] [SMTP: Invalid response code received from server (code: 550, response: Verification failed for <[log in to unmask]> Unrouteable address Sender verify failed)] ===== When I send a test email to these accounts, I receive this error: ----- sent TO yyyyyyy There was an error sending your message: Failed to add recipient: yyyyyyy @msu.edu [SMTP:Invalid response code received from server (code:550,response: 5.1.1 unknown user yyyyyyy @msu.edu <mailto:[log in to unmask]> )] ===== I have reported this to ATS, of course, but I was wondering if anyone else is seeing this same problem. It started on Saturday 4/4/09 for us. ~ Esther Esther V. V. Reed IT Systems Administrator MSU Graduate School email: [log in to unmask] phone: 517/353-3371