below is the code I came up with to get the file data.txt as an attachment and send it out:

sub test_mail {
my $msg = MIME::Lite->new(
   From    =>  'noreply@faroko.com',
   To      =>  'jamie.henson@faroko.com',
   Subject =>  'TESTING',
   Type    =>  'multipart/mixed',
);

$msg->attach(
    Type   =>  'TEST',
    Data   =>  "TESTING ATTACHMENT FEATURE",
);

$msg->attach(
    Type   =>   'TEST',
    Path   =>   'data.txt',
    Filename => 'data.txt',
);

$msg->send;
}