Hello Joel:
There is no particular place to login to manage SPAM, however you can set filters to prevent SPAM from your WebMail interface.
To check your issue further, we will need to analyze the SPAM emails that you have been receiving. Thus, kindly provide the same to us by raising a support request via the below URL, we will check them and get back to you:
http://www.thehostingsupport.com/index.php...ckets&_a=submit
Be sure to include all the relevant details like your domain name, email addresses in question, etc.
Thanks,