A simple test to do is to do a simple php script to send a mail from your host.
Exemple :
<?php
if (mail('your@mail.com','test','test message - 6h14'))
echo 'ok';
else
echo 'ko';
?>
If it's ok you will receive a mail and you will know it's not a hosting problem. So you can investigate in the forum logs of configurations.
If you don't receive email and have the KO message, so, it's a hosting problem
