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Sorry if I should be asking Amazon this, but I've been reading and not found the answer.
I have 4 client who I will be sending out newsletters through sendy.
I have sendy running on my domain, I have successfully set up bounces and complaints with SNS for my domain. [as your notes]
Do I have to do this for each client, or do they use 'my' bounces and complaints 'Topics'?
You only have to setup your bounces and complaints SNS topics once.
Just set the 'Feedback' of ALL your verified emails and/or domains (step 7.5 to 7.7 and step 8.5 to 8.7 of the Get Started Guide).