So much spam since joining ZOHO! Any idea why this is?

So much spam since joining ZOHO! Any idea why this is?

We never got this much spam before. Since signing on with ZOHO our spam emails have tripled. 

Any idea why this is?

We do not expose our address any more than usual but the spike corresponds with ZOHO sign up. 

The spam filter works to stop spam 60% of the "new" spam from getting to the inbox but I keep getting the same spam over and over.
 
Does the ZOHO spam filter not track and delete spam directly from the server?

Thank you, 
Tracy