unable to start sendmail service

Issue

• Getting below errors while starting sendmail service

[root@dhcp210-237 /]# service sendmail restart
Shutting down sm-client:                                   [FAILED]
Shutting down sendmail:                                    [FAILED]
Starting sendmail: 451 4.0.0 /etc/mail/sendmail.cf: line 87: fileclass: cannot open '/etc/mail/local-host-names': Group writable directory
451 4.0.0 /etc/mail/sendmail.cf: line 596: fileclass: cannot open '/etc/mail/trusted-users': Group writable directory
                                                           [FAILED]
Starting sm-client: /etc/mail/submit.cf: line 552: fileclass: cannot open '/etc/mail/trusted-users': Group writable directory
                                                           [FAILED]
[root@dhcp210-237 /]#