Alexander, I did change my /etc/hosts files, including the AAA but this is just my internal domain name. So I corrected it again and my /etc/hosts file is like before. Cat /etc/hosts: > [root@P4 tmp]# cat /etc/hosts # Do not remove the following line, or various programs # that require network functionality will fail. 192.168.0.1 P4.AAA P4 127.0.0.1 localhost.localdomain localhost So here is again the sendmail -bt -d0.12 < /dev/null.8 trace. Just one line change, in the UUCP name, the line with a.k.a. AAA. Thanks [root@P4 tmp]# sendmail -bt -d0.12 < /dev/null Version 8.12.11 Compiled with: DNSMAP HESIOD HES_GETMAILHOST LDAPMAP LOG MAP_REGEX MATCHGECOS MILTER MIME7TO8 MIME8TO7 NAMED_BIND NETINET NETINET6 NETUNIX NEWDB NIS PIPELINING SASLv2 SCANF STARTTLS TCPWRAPPERS USERDB USE_LDAP_INIT OS Defines: ADDRCONFIG_IS_BROKEN HASFCHOWN HASFCHMOD HASFLOCK HASGETDTABLESIZE HASINITGROUPS HASLSTAT HASNICE HASRANDOM HASRRESVPORT HASSETREGID HASSETREUID HASSETRLIMIT HASSETSID HASSETVBUF HASURANDOMDEV HASSTRERROR HASUNAME HASUNSETENV HASWAITPID IDENTPROTO NEEDSGETIPNODE REQUIRES_DIR_FSYNC USE_DOUBLE_FORK USE_SIGLONGJMP Kernel symbols: /boot/vmlinux Conf file: /etc/mail/submit.cf (default for MSP) Conf file: /etc/mail/sendmail.cf (default for MTA) Pid file: /var/run/sendmail.pid (default) libsm Defines: SM_CONF_LDAP_MEMFREE SM_CONF_LONGLONG SM_CONF_MEMCHR SM_CONF_MSG SM_CONF_SEM SM_CONF_SIGSETJMP SM_CONF_SHM SM_CONF_SSIZE_T SM_CONF_STDDEF_H SM_CONF_SYS_CDEFS_H SM_CONF_UID_GID SM_HEAP_CHECK SM_OS=sm_os_linux SM_VA_STD Canonical name: P4.AAA UUCP nodename: P4.AAA a.k.a.: P4 a.k.a.: [192.168.0.1] Conf file: /etc/mail/sendmail.cf (selected) Pid file: /var/run/sendmail.pid (selected) ============ SYSTEM IDENTITY (after readcf) ============ (short domain name) $w = P4 (canonical domain name) $j = P4.AAA (subdomain name) $m = AAA (node name) $k = P4.AAA ======================================================== ADDRESS TEST MODE (ruleset 3 NOT automatically invoked) Enter <ruleset> <address> Philippe -- Philippe, Chiangmai, Thailand