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While hostname is numeric, start postfix failed ... root@qemux86-64:~# hostname 1.2.3.4 root@qemux86-64:~# systemctl restart postfix |Job for postfix.service failed because the control process exited with error code. See "systemctl status postfix.service" and "journalctl -xe" for details. root@qemux86-64:~# systemctl status postfix -l Dec 02 08:05:40 1.2.3.4 aliasesdb[535]: /usr/sbin/postconf: fatal: unable to use my own hostname Dec 02 08:05:41 1.2.3.4 aliasesdb[535]: newaliases: warning: valid_hostname: numeric hostname: 1.2.3.4 Dec 02 08:05:41 1.2.3.4 postfix/sendmail[537]: warning: valid_hostname: numeric hostname: 1.2.3.4 Dec 02 08:05:41 1.2.3.4 aliasesdb[535]: newaliases: fatal: unable to use my own hostname Dec 02 08:05:42 1.2.3.4 postfix[540]: warning: valid_hostname: numeric hostname: 1.2.3.4 Dec 02 08:05:42 1.2.3.4 postfix[540]: fatal: unable to use my own hostname ... Refer meta/recipes-core/initscripts/initscripts-1.0/hostname.sh in oe-core, add check_hostname.sh and invoke it before postfix start, if the hostname is invalid, set "localhost" to main.cf. Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com> Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com> Signed-off-by: Joe MacDonald <joe_macdonald@mentor.com>