logcheck reported this. Is it a mail stucked in the outoging mail queue? Any easy way to find that letter? Security Violations =-=-=-=-=-=-=-=-=-= Mar 21 06:06:34 server sendmail[20786]: gethostbyaddr(192.168.0.16) failed: 1 -- May the Force and Farce be with Linux and you. Join the friendly chit-chat in http://www.linux-sxs.org & news://news.hkpcug.org