Hello, I had a DECstation 5000/120 with Ultrix 4.3. I had upgraded 4.3a and applied Y2k patches, did confiure and reboot. After I applied patches, I haven't been able to send and receive any mail. Whenever I sent mail, I get "host unknown" message. I found that there is no "nslookup" file in my system. I hope this gives you some clue. Please share your knowledge with me. Regards, Hyojeong