Kontaktformular sendet nicht aber keine php- Fehlermeldung

[Norgres]

jetzt ist "send" im code drin aber es funzt immer noch nicht,kann man dabei so vielfalsch machen
<div id="formular">
<form action="enviar1.php" method="post">
<fieldset>
<legend>Nombre y Direccion</legend>
<label for="firma">Empresa:</label><input id="firma" type="text" name="firma" value=""  /><br />

<label for="anrede">Anrede:</label><select id="anrede" name="anrede"><option>Senora</option><option>Senor</option></select><br />
<label for="vorname">Nombre:</label><input id="vorname" type="text" name="vorname" value=""  /><br />
<label for="name">Apellido:</label><input id="name" type="text" name="name" value=""  /><br />
<label for="strasse">Calle / No:</label><input id="strasse" type="text" name="strasse" value="" class="strasse"  />&nbsp;<input type="text" name="strnummer" value="" class="strnummer" maxlength="4" /><br />
<label for="plz">Cod.Postal/Ciudad:</label><input id="plz" type="text" name="plz" value="" maxlength="5" class="plz"  />&nbsp;<input type="text" name="ort" value="" class="ort" /><br />
<label for="land">Pais:</label><input id="land" type="text" name="land" value="" maxlength="5" class="plz"  /><br />
<fieldset>
<legend>Datos de Contacto</legend>
<label for="tnummer">Telefono:</label><input id="tnummer" type="text" name="tnummer" value=""  /><br />

<label for="fnummer">Telefax:</label><input id="fnummer" type="text" name="fnummer" value=""  /><br />
<label for="email">Correo Electronico:</label><input id="mail" type="text" name="email" value=""  /><br />
<label for="url">Pagina Web:</label><input id="url" type="text" name="url" value="http://"  /><br />
</fieldset>
<fieldset id="checkbox">
<legend>Su Deseo</legend>
<label for="rat">Consejos:</label><input id="rat" type="checkbox" name="rat" /><br />
<label for="angebot">Propuesta:</label><input id="angebot" type="checkbox" name="angebot" /><br />
<label for="anruf">Llamada:</label><input id="anruf" type="checkbox" name="anruf"  /><br />
<label for="info">Informacion:</label><input id="info" type="checkbox" name="info" /><br />

</fieldset>
<fieldset>
<legend>Contacto</legend>
<label for="betreff">Asunto:</label><input type="text" id="betreff" name="betreff" value="" /><br />
<label for="nachricht">Mensaje:</label><textarea name="nachricht" id="nachricht" rows="10"></textarea><br />
</fieldset>
<p><input type="submit" name="send" class="submitbtn" value="Enviar" />&nbsp;<input type="reset" name="reset" value="Borrar" class="submitbtn" /></p>
</form>