method one:
a.
[root@sample ~]# /etc/rc.d/init.d/sendmail stop --Close the sendmail service
or
[root@sample ~]# service sendmail stop --Close the sendmail service
Shutting down sendmail: [ OK ]
Shutting down sm-client: [ OK ]
b.
[root@sample ~]# chkconfig sendmail off -- disable sendmail auto-start
c.
[root@sample ~]# chkconfig --list sendmail --Confirm that sendmail has been closed from startup (all are off, then OK)
sendmail 0:off 1:off 2:off 3:off 4:off 5:off 6:off
If chkconfig --list sendmail shows the following:
sendmail 0:off 1:off 2:on 3:on 4:on 5:on 6:off
It can be seen that in the startup mode 2/3/4/5 are all started by default, usually the production system is generally 3, and the service can be turned off according to the level
[root@sample ~]# chkconfig --level 2 sendmail off
[root@sample ~]# chkconfig --level 3 sendmail off
[root@sample ~]# chkconfig --level 4 sendmail off
[root@sample ~]# chkconfig --level 5 sendmail off
[root@sample ~]# chkconfig --list sendmail
sendmail 0:off 1:off 2:off 3:off 4:off 5:off 6:off
Method Two:
[root@sample ~]# ntsysv
Just remove the * in the [ ] in front of sendmail.