Resolved after 59 minutes, affecting Emails, on June 4, 2026.
We're seeing the backlog clear, and emails arriving in inbox! We'll continue to keep an eye on the outbound queue.
Affected components
Update timeline
- investigating Jun 04, 2026, 11:00 PM UTC
We're monitoring an incident on Postmark: https://status.postmarkapp.com/notices/cjagqohtofnqt9ts-email-sending-delays, that's causing a delay for outbound newsletters and transactional emails.
- identified Jun 04, 2026, 11:25 PM UTC
We're currently rerouting traffic to other ESPs. This includes newsletters on the Buttondown domain, and newsletters with managed custom domains: https://docs.buttondown.com/sending-from-a-custom-domain#managed-sending-domain-setup, and transactional emails. Newsletters with a manual sending domain on Postmark servers are still impacted by this outage.
- monitoring Jun 04, 2026, 11:46 PM UTC
Postmark shipped a fix, and are recovering from the incident! We're seeing the backlog start to clear, and we'll continue monitoring.
- resolved Jun 04, 2026, 11:59 PM UTC
We're seeing the backlog clear, and emails arriving in inbox! We'll continue to keep an eye on the outbound queue.
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