[root@localhost pid]# /usr/sbin/postfix start postfix/postfix-script: warning: not owned by postfix: /var/lib/postfix/. postfix/postfix-script: warning: not owned by postfix: /var/lib/postfix/./master.lock postfix/postfix-script: starting the Postfix mail system [root@localhost pid]# rm -rf /var/lib/postfix/./master.lock 删除.lock文件 再次启动： [root@localhost pid]# /usr/sbin/postfix start postfix/postfix-script: warning: not owned by postfix: /var/lib/postfix/. postfix/postfix-script: starting the Postfix mail system [root@localhost pid]# chown postfix.postfix /var/lib/postfix/ [root@localhost pid]# chmod og-w /var/lib/postfix/ [root@localhost pid]# /usr/sbin/postfix start postfix/postfix-script: starting the Postfix mail system [root@localhost pid]# service postfix stop Shutting down postfix: [ OK ] [root@localhost pid]# service postfix restart Shutting down postfix: [FAILED] Starting postfix: [ OK ] [root@localhost pid]# /usr/sbin/postfix start postfix/postfix-script: fatal: the Postfix mail system is already running 启动成功