1. Are you running on Windows, Mac, or some Unix variant? Your mention of folders implies Windows...
2. Perl can send mail, or it can call an outside program to send mail.
3. Sendmail is an outside program to send mail on unix-like systems. It is not a folder/directory, it is a program.
4. See the answers in How do I send e-mail from my Perl Program?
5. Please be more specific in the future. What does the program you are running look like? What errors does it give you when it doesn't work?

#!/usr/bin/perl

use Mail::Mailer;

 $from_address = "vrempire";
 $to_address = "vrempire\@hotmail.com";
 $subject = "REGISTRATION FOR NEW MEMBER";
 $body = "REGISTRATION FOR NEW MEMBER";
 $mailer = Mail::Mailer->new();
    $mailer->open({ From    => $from_address,
                    To      => $to_address,
                    Subject => $subject,
                  })
        or die "Can't open: $!\n";
    print $mailer $body;
    
    $mailer->close();
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Bad command or file name
Can't locate auto/Mail/Util/mailaddress.al in @INC (@INC contains: c:/
+Perl/lib c:/Perl/site/lib .) at C:/Perl/lib/Mail/Mailer/smtp.pm line 
+21
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