When registering on a bbPress forum, this is displayed after you submit your registration:
Make sure to whitelist our domain (http://www.mywebsite.com) so the confirmation email doesn't get caught by any filters.
That's not really how whitelists work. Normally, you whitelist a domain or an email address, so wouldn't it be better to say this in register.php on line 11:
<?php printf(__("A password will be mailed to the email address you provide. Make sure to whitelist our email address (%s) so the confirmation email doesn't get caught by any filters."), bb_get_option( 'admin_email' )) ?>
Make sense?