Theres an older stray male cat

In the area weve moved to and hes been coming to our garden screaming, and im starting to wonder if the last tenants left him behind :/ anyways weve made a little outdoor house for him and out some wet food and biscuits out each day for him , we dont see him much but the food is always eaten ( the house got put out today so ive sprayed it with catnip spray and hopefully he likes it ) Id let him in but we have smokey and he isnt neutered because hes always been an indoor and only cat , and i dont think this old boy is either because ive seen him spray before :/ But atleast he can be comfortable dry warm and fed :) ive out the house near our hot tub heater too so It stays warmer at night