This afternoon at approximately 2:15-2:30, the mailrelay system encountered severe problems that prevented it from delivering mail to yorku.ca addresses. If you received a message from the Mail Delivery System around that time similar to this, ----- The following addresses had delivery problems ----- [log in to unmask] (unrecoverable error) ----- Transcript of session follows ----- ... while talking to yorku.ca.: >>> RCPT To:<[log in to unmask]> <<< 550 <[log in to unmask]>... User unknown you should resend the message to all the addresses listed in the "User unknown" lines. The source of the problem was a corrupted file used by the mail delivery program to identify valid addresses. The problem has been fixed. We regret the inconvenience this has caused. -- Marshal Linfoot Phone: (416) 736-5257 x22691 Manager, UNIX Technical Support FAX: (416) 736-5701 CCS, York University E-mail: [log in to unmask]