I am new to Zoho mail and have noticed that even though I have not set up any spam filters, blacklists etc, I am still getting mail put into my SPAM folder.  Those emails are in fact SPAM so there must be an auto SPAM service doing this.  My questions then are:  What exactly is the auto SPAM detection service and how does it work?  Are there any settings to do with this service e.g., strength setting, ON/OFF? 

Further, I would like this service ON but then have the ability to view these selected emails in my local client POP inbox (or SPAM folder).  I have seen a setting somewhere that says "Pass spam through" but I cannot find it again and I need to know whether if it is passed through, does the email get marked in anyway or put into a folder?