Buttondown experienced a minor incident on June 4, 2026 affecting Emails, lasting —. The incident has been resolved; the full update timeline is below.
Affected components
Update timeline
- investigating Jun 04, 2026, 11:00 PM UTC
Status: Investigating 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. Affected components Emails (Partial outage)
- identified Jun 04, 2026, 11:25 PM UTC
Status: Identified 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. Affected components Emails (Partial outage)
- monitoring Jun 04, 2026, 11:46 PM UTC
Status: Monitoring Postmark shipped a fix, and are recovering from the incident! We're seeing the backlog start to clear, and we'll continue monitoring. Affected components Emails (Degraded performance)
- resolved Jun 04, 2026, 11:59 PM UTC
Status: Resolved We're seeing the backlog clear, and emails arriving in inbox! We'll continue to keep an eye on the outbound queue. Affected components Emails (Operational)