Problems with mail command

A big HELLO to php-install, I have a problem with the mail command - it doesn't work! I'm using a simple script to test this.... <?php $ret = mail("webmaster@subhc.org.uk", "Join", "message1"); print $ret; ?> When this is run (http://www.subhc.org.uk/mailto.php) it repots a return code of 1 (success) but no mail is ever received. Part of the problem is that I do not have control over the server as I only rent a domain name on the server. The support people have said that as they don't use this commend then they are unable (unwilling?) to fix it. I've checked as much as I can - the PHP setupis pointing to the sendmail program and it is in the expected place (/usr/sbin/sendmail). If anyone can help point me in the right direction to try and solve this I'd be grateful - php info for the site can be found at http://www.subhc.org.uk/phpinfo.php -- Thanks, Neil Harrison