Like others, I'm trying to set up the SNS. My sendy install is running in a virtual host on DigitalOcean and I was able to confirm the bounces topic instantly with the endpoint http://sendy.spoil.io/includes/campaigns/bounces.php. It found the endpoint and I got back the proper value for the confirmation.
When I try making the complaints topic though, I keep getting: "com.amazonaws.services.sns.model.InvalidParameterException: Invalid parameter: Unreachable Endpoint (Service: AmazonSNS; Status Code: 400; Error Code: InvalidParameter; Request ID: c991e2af-019c-5324-b64d-ae3981c65cbe)". The endpoint for it is http://sendy.spoil.io/includes/campaigns/complaints.php and it loads fine from my browser and my cell phone as well. If I go to modify the source code I can make it print text and I can see it printing fine on the browser.
Is there something I'm missing here? I'm running out of ideas haha