Zoho Mail add-on pulls in ALL my email to Zoho Mail. The only mail I want to see in the inbox is email from EXISTING CONTACTS/LEADS in Zoho. The rest I'd like to place in another folder or delete all together.

I cannot figure out how to create a filter in mail based on Zoho CRM Contacts or even Zoho Contacts (assuming I need to actually import manually here)

Any help here would be appreciated as I'm in my trial period and figuring this out is a deal maker/breaker for us.