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    ### Create a new multipart message:
    $msg = MIME::Lite->new( 
...
                 Disposition => 'attachment'
                 );

    ### Format as a string:
    $str = $msg->as_string;
...

    ### Print to a filehandle (say, a "sendmail" stream):
    $msg->print(\*SENDMAIL);

    ### Send in the "best" way (the default is to use "sendmail"):
    $msg->send;