Increased bounce or delay rate for Apple domains

What to do

• Check whether you use SparkPost SMTP Delivery - USA, SMTP Delivery - EUROPE in eu, us. 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 34m it lasted.

  Anything that failed between 2026-04-05 18:27 UTC and 2026-04-05 19:01 UTC may need a replay.

• Subscribe to SparkPost's feed to hear about the next one first. RSS feed

  https://down.guide/feed?provider=sparkpost works in Slack (/feed subscribe), Discord feed bots and any RSS reader.

Updates from SparkPost 4

1. investigatingApr 5, 2026, 5:02 PM UTC

   We are currently investigating reports of delayed or failed email deliveries to Apple-hosted domains. Messages to non-Apple domains are unaffected. We will provide updates as more information becomes available.

   provider

2. identifiedApr 5, 2026, 5:58 PM UTC

   The issue was caused by an Apple iCloud Mail outage (https://www.apple.com/support/systemstatus/), which Apple has since marked as resolved. Bounce rates and delivery delays to Apple domains have returned to normal levels. We are currently reviewing our suppression lists to identify and remove any recipients that may have been incorrectly added during the incident.

   provider

3. monitoringApr 5, 2026, 6:27 PM UTC

   Apple has implemented a fix and we are monitoring the results.

   provider

4. resolvedApr 5, 2026, 7:01 PM UTC

   Delivery rates to Apple domains have returned to normal with no further elevated delays or bounces. We will perform any necessary post-incident cleanup of suppression lists to ensure no recipients were incorrectly suppressed during the outage. NOTE: As of Monday April 5th at 9PM EDT the cleanup has been completed. All recipient addresses to Apple or Apple Private Relay domains that were suppressed during Apple's incident window were removed.

   provider

Corrections

None so far.

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