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If you are using queues you cannot serialize Objects that contains closures, it's the way PHP works. Every time you push a job onto a queue, Laravel serializes its properties to a string that can be written to the database, but anonymous functions (e.g. functions that do not belong to any class) cannot be represented as a string value, thus they cannot be serialized. So basically when you push your RequestMail job onto the queue, Laravel tries to serialize its properties, but $request is an object that contains closures, so it cannot be serialized. To solve the problem you have to store in the RequestMail class only properties that are serializable: