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What additional steps, aside editing the URL in the config file, do I need to take to switch Sendy over to HTTPS?
The SNS subscriptions are showing the HTTP protocol.
The situation currently is that Sendy reports have 0 complaints and 0 bounces since the config switch was made.
Delete ALL SNS 'Topics' and 'Subscriptions' in your Amazon SNS console. Sendy will automatically re-create them the next time you're at the 'Define recipients' page. If you're now using HTTPS, Sendy will create the SNS subscriptions using HTTPS.