- Level
- confirmed
- Worst impact
- Degraded
- Components
- Email Deliverability
- Regions
- us
- Down Index
- 23of 100
What to do
Check whether you use Klaviyo Email Deliverability in 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 2h it lasted.
Anything that failed between 2026-07-02 12:17 UTC and 2026-07-02 14:17 UTC may need a replay.Subscribe to Klaviyo's feed to hear about the next one first. RSS feed
https://down.guide/feed?provider=klaviyo works in Slack (/feed subscribe), Discord feed bots and any RSS reader.
Updates from Klaviyo 2
- investigating
Starting at 02:30AM US/Eastern on 07/02/2026, a subset of customers are currently experiencing an increase in bounced emails to Yahoo and AOL recipients with the reason of "554 Message not allowed - [PH01] Email not accepted for policy reasons.". Our Engineering and Deliverability teams are actively investigating and working with Yahoo to resolve the issue. We do not recommend resending to those bounced recipients at this moment in time.
provider
- resolved
The block within the Yahoo infrastructure that resulted in these elevated bounces has been resolved. Customers can safely resend to bounced recipients from this time period. This incident has been resolved.
provider
Reports count in aggregate; nothing about you is shown.
Corrections
None so far.
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Questions about DWN-0f824e2997
Is Klaviyo still down?
No, this incident was resolved 2026-07-02 14:17 UTC. For Klaviyo's live state, see https://down.guide/klaviyo.
How long did it last?
2h, from 2026-07-02 12:17 UTC to 2026-07-02 14:17 UTC, by the times Klaviyo posted.
What was affected?
Klaviyo named Email Deliverability in us.
What caused it?
Klaviyo hasn't published a root cause. If it does, it shows here.
Where does this come from?
Klaviyo's official status page, https://status.klaviyo.com, quoted verbatim. down.guide's own probes, reports and social counts are labeled as ours.