kontaktformular sendet nicht?

<form action="/kontaktsenden.php" method="post">
<fieldset>
<label for="nachricht">Ihre Nachricht:</label>
<textarea name="nachricht" cols="35" rows="7" id="nachricht"></textarea>
<label for="name">Name:<em>*</em></label>
<input name="name" type="text" id="name" size="30" />
<label for="strasse">Strasse</label>
<input name="strasse" type="text" id="strasse" size="30" />
<label for="plz">Postleitzahl:</label>
<input name="plz" type="text" id="plz" size="30" />
<label for="ort">Ort:</label>
<input name="ort" type="text" id="ort" size="30" />
<label for="email">Ihre E-Mail-Adresse:<em>*</em></label>
<input name="email" type="text" id="email" size="30" />
<label for="telefon">Telefonnummer:<em>*</em></label>
<input name="telefon" type="text" id="telefon" size="30" />
<img src="captcha.php" alt="sicherheitscode" />
<label for="nachricht">Code*</label>
<input name="sicherheitscode" type="text" id="sicherheitscode" size="10" maxlength="5" />
<input type="submit" name="Senden" id="Senden" value="Senden" />
</fieldset>
</form>

$headers = mail($webmaster, $emailBetreff, $body);