I have a diff showing the difference I have made to sendmail.mc:
112c112 < DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl --- >dnl DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl
Unless you intend to provide service to internet users, you should not make that change.