It is not Vbulletin. Vbulletin runs on almost any server.
Is that the only error you get and did it just start happening?
If you do not want the emails just remove your email from the config.php file.
##I'm not saying to remove your email address and not fix these issues. I am just saying that if you're inbox is getting flooded than you can remove your address from config just until you fix the issues. I'm fairly certain everyone knew this is what I meant but apparently I need to clarify.