send to https for newsletter subscription

hi, i use a 3rd party newsletter and don’t like to put the subscribe form into an iframe.
is it possible to send form values from contactform7 to an url?
i tried to put it instead of a email adress but that don’t work.

<form action="https://tools.emailsys.net/8/155/1gkpnud/subscribe/form.html" method="post">
<input type="text" class="form_field" placeholder="email" name="email" id="email" value="" />
<input type="submit" class="form_button_submit" value="subscribe" />

regards
telemarker