cannot open `/usr/share/sendmail-cf/m4/cf.m4
m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf /etc/mail/sendmail.mc:10: m4: cannot open `/usr/share/sendmail-cf/m4/cf.m4': No such file or directory Reason : sendmail-cf is not installed yum install sendmail-cf