MAIL command will not work/ Exim Problem?

This is funny because I had this problem on a local server on my network too. Anywho, I have a php script that uses the mail() to send mail(which its not doing). And if I recall the mail function uses the prompt command MAIL, which does not work. What can I do to get the MAIL command working (i forgot how to get it to work, or what to install I should say), and is that maybe why the php mail() is not working? According to the php ini file it is configured to be able to send mail. Exim, PHP/4.3.3. This problem may go deeper than I think, I just checked some logs in cpanel and it appears as though most domains (yahoo.com and msn.com) are coming back as unroutable for mail(yes they are valid email addresses).

Code: 
List of errors
--------------

    1 xxx@bob.net R=fail_remote_domains: unrouteable mail
	    domain "bob.net"

    2 xxx@yahoo.com R=fail_remote_domains: unrouteable
	    mail domain "yahoo.com"

   18 xxx@gmail.com R=fail_remote_domains: unrouteable
	    mail domain "gmail.com"

    1 xxx@stevenetworks.com R=fail_remote_domains: unrouteable
	    mail domain "stevenetworks.com"

    7 xxx@porteightyhosting.com.com 
	    R=fail_remote_domains: unrouteable mail domain "porteightyhosting.com.com"

   28 xxx@stevenetworks.com R=fail_remote_domains: unrouteable
	    mail domain "stevenetworks.com"

    7 xxx@msn.com R=fail_remote_domains: unrouteable
	    mail domain "msn.com"

    1 xxx@stevenetworks.com R=fail_remote_domains: unrouteable
	    mail domain "stevenetworks.com"

   26 xxx@yahoo.com R=fail_remote_domains: unrouteable
	    mail domain "yahoo.com"

  148 xxx@s1.porteightyhosting.com :
	    Unrouteable address

 

 

 

 

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