Could you please provide appropriate solution for our exchange organization . We have single exchange 2016 server with mailbox role installed and we do not implemented exchange edge or any 3rd party smtp hosted at this moment and we do not have in house spam filtering solution. We are receiving more Spam the time MX cut over from our 3rd party email hosting service. Any suggestion for having in house Spam solution with lower host and reliable for our small organization ( 50 users). Thank you in advance.