This entry starts the sendmail daemon on system startup. This means that the system can operate as a mail server. sendmail is a service with many historical vulnerabilities and where possible should be disabled. If the system is not required to operate as a mail server i.e. sending, receiving or processing e-mail, comment out the sendmail entry.
Solution
In /etc/rc.tcpip, comment out the sendmail entry- chrctcp -d sendmail