Christian kann es sein das es dann so stimmt?
<?php
$delimiter = $_POST["delimiter"];
<form action="formmail.php" method="post">
<input type="hidden" name="mailto" value="Anmeldung@clander12ifverrueckten.de.tk">
<input type="hidden" name="subject" value="Anmeldung">
<input type="hidden" name="delimiter" value=": ">
<!-- Hier die restlichen Formular-Felder -->
<p>Anrede:</p>
<p>
<input type="radio" name="Anrede" value="Herr"> Herr <br>
<input type="radio" name="Anrede" value="Frau"> Frau<br>
</p>
<p>Vorname:<br>
<input name="vorname" type="text" size="30" maxlength="30">
</p>
<p>Managername:<br>
<input name="Managername" type="text" size="30" maxlength="40">
</p>
<p>Teamname:<br>
<input name="Teamname" type="text" size="30" maxlength="30">
</p>
<p>Liga:<br>
<input name="Liga" type="text" size="30" maxlength="40">
</p>
<input type="submit" value="Abschicken!"> <input type="reset" value="Zurücksetzen">
</form>
header("Location: $returnhtml");