<form action="http://www.domain.com/sendy/subscribe" method="POST" accept-charset="utf-8">
<label for="name">Name</label><br/>
<input type="text" name="name" id="name"/>
<br/>
<label for="email">Email</label><br/>
<input type="text" name="email" id="email"/>
<br/>
<input type="hidden" name="list" value="xxx-LISTID-Check in Sendy-xxx"/>
<input type="submit" name="submit" id="submit"/>
</form>