HTTPS Tracking Certificate Creation / Renewal blocked by Let's Encrypt Outage

What to do

• Check whether you use Mailgun API. Check your stack

  Paste a package.json, lockfile, Terraform or a list of domains at down.guide/stack to see every provider you depend on.

• Confirm your retries, queues and scheduled jobs caught up after the 11h 37m it lasted.

  Anything that failed between 2025-07-21 23:56 UTC and 2025-07-22 11:33 UTC may need a replay.

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Updates from Mailgun 3

1. identifiedJul 21, 2025, 11:56 PM UTC

   Let's Encrypt, the certificate issuer used for creating certificates on customer tracking domains is experiencing an outage (https://letsencrypt.status.io/). Attempting to generate or regenerate a tracking certificate will not succeed until service is restored.

   provider

2. monitoringJul 22, 2025, 5:22 AM UTC

   The current status of Let's Encrypt infrastucture is "[Identified] We have deployed mitigations for the failure of our internal DNS servers. Issuance of certificates is now succeeding, though we are still recovering from the resulting high traffic volumes." We are monitoring the situation and will update our status page accordingly.

   provider

3. resolvedJul 22, 2025, 11:33 AM UTC

   This incident has been resolved.

   provider

Corrections

None so far.

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