sm-client을 시작하고 있습니다: sendmail: fatal: flush queue mode requires no recipient
해결:rpm -qa | grep postfix 으로 검색된 패키지들을 모두 삭제 후 sendmail을 실행 하면 아무 문제 없시 잘 됩니다.
[root@localhost ~]# rpm -qa | grep postfix
postfix-pflogsumm-2.2.10-1.1AX
postfix-2.2.10-1.1AX
[root@localhost ~]# rpm -e postfix-pflogsumm-2.2.10-1.1AX
[root@localhost ~]# rpm -e postfix-2.2.10-1.1AX
[root@localhost ~]# /etc/rc.d/init.d/sendmail start
postfix-pflogsumm-2.2.10-1.1AX
postfix-2.2.10-1.1AX
[root@localhost ~]# rpm -e postfix-pflogsumm-2.2.10-1.1AX
[root@localhost ~]# rpm -e postfix-2.2.10-1.1AX
[root@localhost ~]# /etc/rc.d/init.d/sendmail start

