The most common cause of receiving bulk amounts of spam is your email address may be set as the "catchall" or "wildcard" for the domain. This means that all emails sent to your domain name that are wild i.e. smarty@yourdomain.com or test234@yourdomain.com will all come through to your email inbox. The best way to cut this down or prevent from this happening is to remove yourself as the wildcard.
You're able to do this yourself by logging into your juiced control panel, otherwise feel free to give us a call 0800 89 2070 and we can remove it for you.