Service Issue: Outbound sending via SMTP. Messages are being accepted, with a delay in sending.

Ongoing for 10 minutesAffected: SMTP (sending)

Last update : We're investigating delays in outbound sending via SMTP in the Americas region. Messages are being accepted, though sending is delayed. EMEA and APAC are not impacted.

← Incidents

DEGRADEDService Issue: Outbound sending seeing high bounce rates from Spamhaus

Jun 7, 2021, 10:02 - 10:54 AMResolved after an hourAffected: API, SMTP (sending)

Incident’s History


Bounces rates have normalized and we are not seeing any lingering Spamhaus issues. We will continue to monitor.

We are seeing bounce rates return to normal levels and the effect of this Spamhaus issue decreasing quickly.

We have learned that this is a global issue with Spamhaus and not specific to Postmark. We are still not seeing any on our IP's blacklisted will continue to update here as bounces subside.


We are looking into an increase in bounces from Spamhaus. Our IPs are Not listed on this blacklist provider so we are continuing to investigate a root cause.