problem sending mail

Hi all
I am trying to send a mail with the following code and the last print 
statement doesn't print, ie, the mail is not sent.
This code is called on submitting a form on the web
--------------------
open(MAIL, "/usr/sbin/sendmail -oi -t") || die "Can't open mail";
print MAIL <<END;
To: amancgiperl\@hotmail.com
Subject: News
all the message goes here
END

close(MAIL);
print "The mail has been sent successfully<BR><BR>";
---------------------
If I remove the -oi -t switch from the first statement, the print statement 
works but the mail is not sent.
Please help and let me know what could I be missing, in or above the code.

Thanks
Aman

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