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AWS SNS Email Alerts Not Arriving? The Subscription Confirmation Trap Explained

You've wired up an SNS topic, attached an email endpoint, and deployed your alerting pipeline — but your inbox is silent. Nine times out of ten, the culprit is a single missed step: the subscription confirmation email that AWS sends before it will deliver a single message to your endpoint. TL;DR Step Action Status if Skipped 1 Create SNS Topic Topic exists but is inert 2 Subscribe email endpoint to topic Subscription stays in PendingConfirmation 3 Click confirmation link in inbox ❌ No messages ever delivered 4 Publish message to topic ✅ Email delivered only after step 3 Why SNS Requires Subscription Confirmation AWS SNS uses a double opt-in model for email and HTTP/HTTPS endpoints. This is not an arbitrary UX decision — it is a security and anti-spam control. Without it, any AWS account could weaponize SNS to flood arbitrary email addresses with messages. The confirmation handshake proves that ...
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Lambda Infinite Loop with S3: How to Prevent Recursive Triggers

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S3 Public Access Denied errors catch engineers off guard when the object ACL is already set to public — the real blocker is often a bucket-level or account-level override silently winning. TL;DR: S3 Public Access Denied Fix at a Glance Step What to Do 1 Check account-level Block Public Access — it overrides everything silently 2 Check bucket-level Block Public Access settings and disable the blocking flags 3 Verify the bucket policy does not contain an explicit Deny for public reads 4 Confirm the object ACL is actually set to public-read (or use a bucket policy instead) 5 Test the public URL and validate with a signed URL to isolate the layer Why S3 Public Access Denied Happens Even After Setting an Object Public The direct answer: setting an object ACL to public-read is necessary but not sufficient. AWS evaluates public access through a layered permission model — account-level Block Public A...
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