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When I set up 5.21 I deleted the topics and subscriptions at aws having read somewhere that Sendy now creates these. So far we have only done test emails but nothing has been set up in aws yet.
I can do it manually but if Sendy can do it, that seems better.
Sendy will automatically setup the Amazon SNS bounces and complaints topics and subscriptions at the 'Define recipients' page (the page where you select lists to send your campaign to).
Yes, seems to have worked.