"That's sounds great, be happy to work on it. You should go talk to [my manager, a PM, whatever] to see when we can work it in. Here, I'll [walk you over, CC th

"That's sounds great, be happy to work on it. You should go talk to [my manager, a PM, whatever] to see when we can work it in. Here, I'll [walk you over, CC them on this email, whatever]." When you're getting direction from a bunch of different people who aren't coördinating, set them against each other. What shakes out will be a saner workload, and you're not the one having to say no.