- Level
- confirmed
- Worst impact
- Degraded
- Components
- Email delivery
- Down Index
- 26of 100
What to do
Check whether you use Substack Email delivery. 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 44d 19h it lasted.
Anything that failed between 2026-03-27 22:20 UTC and 2026-05-11 17:55 UTC may need a replay.Subscribe to Substack's feed to hear about the next one first. RSS feed
https://down.guide/feed?provider=substack works in Slack (/feed subscribe), Discord feed bots and any RSS reader.
Updates from Substack 2
- investigating
We’re investigating an issue affecting reported open rates for some publishers. Current evidence suggests this is related to how Gmail loads tracking pixels, and does not indicate a change in engagement or deliverability. We take responsibility for ensuring these metrics are accurate and are prioritizing improvements to our open rate tracking so this is resolved as quickly as possible. We will continue to provide updates here as we learn more.
provider
- resolved
This incident has been resolved.
provider
Reports count in aggregate; nothing about you is shown.
Corrections
None so far.
Something wrong on this page? Report an error or send us a note. Every fix is listed here.
Questions about DWN-6f75c9ff59
Is Substack still down?
No, this incident was resolved 2026-05-11 17:55 UTC. For Substack's live state, see https://down.guide/substack.
How long did it last?
44d 19h, from 2026-03-27 22:20 UTC to 2026-05-11 17:55 UTC, by the times Substack posted.
What was affected?
Substack named Email delivery.
What caused it?
Substack hasn't published a root cause. If it does, it shows here.
Where does this come from?
Substack's official status page, https://substack.statuspage.io, quoted verbatim. down.guide's own probes, reports and social counts are labeled as ours.