The only thing that I can think of is to either get a different cat door that opens only to cats wearing a special collar or to trap the stray and take him to a shelter. Since he has found a nice place with food and shelter he has no plans to leave. He is spraying cause he wants the house to be his territory.
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PHWildCat/Tessa and 18 cats, 1 dog and even a hamster
Cat Board Monitor and Chat Host
Pet Hobbyist
A house without cats is like a garden without flowers

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