You are trying to install and configure sendmail "Server" into a Solaris 5.1 env, right?
Your Os is Solaris 5.1, but you are following a Solaris 11 document?
Is it 5.1 or 5.10?
Your configuration is not okay and there is no mail server listening for SMTP on your machine.
I think you need to start over.
Take a look at the links given in this url- >
https://docs.oracle.com/cd/E19253-01/816-4555/There sendmail related documentation there..
For ex this->
https://docs.oracle.com/cd/E19253-01/816-4555/mailadmin-13/index.htmlAlso, you can give this a try ->
http://thegreyblog.blogspot.com/2009/11/configuring-sendmail-on-solaris-10.html