All Systems Operational

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Black Friday/Cyber Monday Monitoring
Our team will be actively monitoring email delivery performance 24/7 throughout the BFCM period.
If you're experiencing delivery concerns during this high-volume period, reach out through any of your provided support channels and we'll prioritize BFCM-related issues immediately.

Uptime over the past 90 days. View historical uptime.
SparkPost Application (WebUI) Operational
90 days ago
100.0 % uptime
Today
SparkPost Application - USA ? Operational
90 days ago
100.0 % uptime
Today
SparkPost Application - EUROPE Operational
90 days ago
100.0 % uptime
Today
SMTP Delivery (Outbound Message Delivery) Operational
90 days ago
100.0 % uptime
Today
SMTP Delivery - USA Operational
90 days ago
100.0 % uptime
Today
SMTP Delivery - EUROPE Operational
90 days ago
100.0 % uptime
Today
Transmissions API Operational
90 days ago
100.0 % uptime
Today
Transmissions API - USA Operational
90 days ago
100.0 % uptime
Today
Transmissions API - EUROPE Operational
90 days ago
100.0 % uptime
Today
SMTP API Operational
90 days ago
100.0 % uptime
Today
SMTP API - USA Operational
90 days ago
100.0 % uptime
Today
SMTP API - EUROPE Operational
90 days ago
100.0 % uptime
Today
Metrics API Operational
90 days ago
100.0 % uptime
Today
Metrics API - USA Operational
90 days ago
100.0 % uptime
Today
Metrics API - EUROPE Operational
90 days ago
100.0 % uptime
Today
Events API ? Operational
90 days ago
100.0 % uptime
Today
Events API - USA Operational
90 days ago
100.0 % uptime
Today
Events API - EUROPE Operational
90 days ago
100.0 % uptime
Today
Relay Webhooks Delivery Service Operational
90 days ago
100.0 % uptime
Today
Relay Webhooks - USA Operational
90 days ago
100.0 % uptime
Today
Relay Webhooks - EUROPE Operational
90 days ago
100.0 % uptime
Today
Sending Domains API Operational
90 days ago
100.0 % uptime
Today
Sending Domains API - USA Operational
90 days ago
100.0 % uptime
Today
Sending Domains API - EUROPE Operational
90 days ago
100.0 % uptime
Today
Suppression List API Operational
90 days ago
100.0 % uptime
Today
Suppression List API - USA Operational
90 days ago
100.0 % uptime
Today
Suppression List API - EUROPE Operational
90 days ago
100.0 % uptime
Today
Event Webhook Delivery Service Operational
90 days ago
100.0 % uptime
Today
Event Webhooks - USA Operational
90 days ago
100.0 % uptime
Today
Event Webhooks - EUROPE Operational
90 days ago
100.0 % uptime
Today
Engagement Tracking Service Operational
90 days ago
100.0 % uptime
Today
Engagement Tracking Service (redirecting clicks and serving opens) - USA Operational
90 days ago
100.0 % uptime
Today
Engagement Tracking Service (redirecting clicks and serving opens) - EUROPE Operational
90 days ago
100.0 % uptime
Today
Mailbox Provider Service Interruption ? Operational
Blocklist API Operational
90 days ago
100.0 % uptime
Today
Blocklist API - USA Operational
90 days ago
100.0 % uptime
Today
Blocklist API - EUROPE Operational
90 days ago
100.0 % uptime
Today
Alerts API Operational
90 days ago
100.0 % uptime
Today
Alerts API - USA Operational
90 days ago
100.0 % uptime
Today
Alerts API - EUROPE Operational
90 days ago
100.0 % uptime
Today
Operational
Degraded Performance
Partial Outage
Major Outage
Maintenance
Major outage
Partial outage
No downtime recorded on this day.
No data exists for this day.
had a major outage.
had a partial outage.

No incidents or maintenance related to this downtime.

Nov 30, 2025

No incidents reported today.

Nov 29, 2025

No incidents reported.

Nov 28, 2025
Yahoo Mail Sending Delays
Resolved - This incident has been resolved.
Nov 28, 05:17 EST
Monitoring - We are seeing signs of recovery. Yahoo's mail servers are beginning to accept messages normally and delivery rates are improving.
Current Status:

Yahoo appears to be resolving their infrastructure issues
Delivery success rates are increasing
Queued messages are being processed and delivered
We continue to monitor closely to ensure full recovery

What to Expect:
Messages that were queued during the incident are being delivered as Yahoo's systems recover
You may see a temporary spike in delivery volume as the backlog clears
Delivery times should return to normal as the queue processes

We will continue to monitor the situation closely and will post a final update once we confirm full recovery.
Nov 28, 04:54 EST
Identified - We have confirmed this is an issue with Yahoo's receiving infrastructure. Yahoo's mail servers continue to return temporary failure codes that are preventing normal mail delivery.

Current Status:
The issue has been confirmed to be on Yahoo's side
Our sending infrastructure is operating normally
All queued messages will be delivered automatically once Yahoo resolves their infrastructure issues
No customer action is required

Error Messages You May See:
If you're monitoring your delivery logs, you may see the following (non-inclusive) temporary failure messages from Yahoo:
451 4.4.2 [internal] no BODY response
451 4.4.2 [internal] connection closed by remote host
451 4.4.2 [internal] no MAIL FROM response
451 4.4.2 [internal] no RCPT TO response
421 Service not available, closing transmission channel tnmpmscs

These are all temporary errors from Yahoo's infrastructure. Messages receiving these errors are being automatically retried and will be delivered once Yahoo resolves the issue.

We are continuing to monitor the situation and will provide updates as Yahoo works to resolve this on their end.
Nov 28, 04:53 EST
Investigating - We are currently experiencing delays in email delivery to Yahoo recipients. Our monitoring systems have detected increased queue times for messages destined for Yahoo domains (yahoo.com, ymail.com, etc.).
Current Status:

Email delivery to Yahoo is experiencing delays
This appears to be a receiving issue on Yahoo's infrastructure
Our sending systems are operating normally
All other ISPs and providers are unaffected

Impact:
Messages to Yahoo recipients are being queued and will be delayed
No messages are being lost or dropped
Our systems will continue automatically retrying delivery per our normal retry schedule
Nov 28, 04:40 EST
Nov 27, 2025
Emergency SparkPost Templates API Database Maintenance
Completed - The scheduled maintenance has been completed.
Nov 27, 10:42 EST
In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.
Nov 27, 08:42 EST
Scheduled - We are performing emergency maintenance on our email template infrastructure to ensure optimal performance during the Black Friday/Cyber Monday period.

Background:
Due to an increased in preview volumes we're proactively scaling our template database to maintain the high performance standards you expect during peak season.

Expected Impact:
Minimal to no impact expected for most operations
Template preview API may experience brief intermittent delays or latency during the maintenance window
Email sending and delivery operations continue unaffected

Timeline:
We expect this maintenance to take less than 2hours.
We're taking this proactive step now to ensure a smooth, reliable Black Friday weekend for all customers.
Updates will be posted here as work progresses.
Nov 27, 08:41 EST
Outbound message delivery is delayed/slow for some SparkPost customers (US hosted only)
Resolved - We have seen fully recovery from this delay event. A postmortem will be posted shortly detailing the root cause and steps we have taken to prevent a reoccurrence.
Nov 27, 10:24 EST
Update - We continue to see significant recovery on the delayed messages. Continuing to monitor and will post the next status after full recovery.
Nov 27, 09:50 EST
Update - The MTA1 cluster is beginning to stabilize and we are seeing active recovery. We will continue to monitor and provide updates as the cluster fully recovers.
Nov 27, 09:44 EST
Monitoring - A fix has been implemented and we are monitoring the results.
Nov 27, 09:23 EST
Identified - The issue has been identified and a fix is being implemented.
Nov 27, 09:22 EST
Investigating - We are investigating an increase in delivery latency for some outbound messages. (NOTE: This does not impact our customers hosted in the EU.)
Nov 27, 09:22 EST
High response times on the API
Resolved - This incident was resolved.
Nov 27, 08:01 EST
Update - We are continuing to investigate this issue.
Nov 27, 07:26 EST
Investigating - We are currently investigating this issue.
Nov 27, 06:24 EST
Nov 26, 2025

No incidents reported.

Nov 25, 2025

No incidents reported.

Nov 24, 2025
Scheduled Database Maintenance US - Prep for Black Friday & Cyber Monday
Completed - The scheduled maintenance has been completed.
Nov 24, 22:29 EST
Verifying - Verification is currently underway for the maintenance items.
Nov 24, 22:28 EST
In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.
Nov 24, 22:00 EST
Scheduled - To ensure our platform is fully optimized for the high-volume Black Friday period, we’ll be performing scheduled maintenance on our sending domains database cluster in our US region starting at 22:00 EST on November 24. The expected duration is less than five minutes, though the full window is reserved as an abundance of caution.

*What to Expect*
During this window, the Sending Domains API will be temporarily unavailable. If you attempt to manage sending domains during this time, you may see an error, simply retry the request after maintenance is complete.

*Sending & Delivery*
Your ability to send and deliver messages should not be impacted. We expect most active senders to experience no interruption at all, and mail flow will continue as normal for domains already in regular use.
If you do encounter a send or injection error during the window, it is safe to wait briefly and retry the send, following our best practices for handling 5xx responses:
https://support.sparkpost.com/docs/tech-resources/smtp-rest-api-performance

This proactive maintenance will help ensure a smooth, reliable sending experience throughout the busiest weekend of the year.
Nov 21, 12:22 EST
Scheduled Database Maintenance EU - Prep for Black Friday & Cyber Monday
Completed - The scheduled maintenance has been completed.
Nov 24, 17:00 EST
Verifying - Verification is currently underway for the maintenance items.
Nov 24, 16:16 EST
In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.
Nov 24, 16:00 EST
Scheduled - To ensure our platform is fully optimized for the high-volume Black Friday period, we’ll be performing scheduled maintenance on our sending domains database cluster in our EU region starting at 22:00 EST on November 24. The expected duration is less than five minutes, though the full window is reserved as an abundance of caution.

*What to Expect*
During this window, the Sending Domains API will be temporarily unavailable. If you attempt to manage sending domains during this time, you may see an error, simply retry the request after maintenance is complete.

*Sending & Delivery*
Your ability to send and deliver messages should not be impacted. We expect most active senders to experience no interruption at all, and mail flow will continue as normal for domains already in regular use.
If you do encounter a send or injection error during the window, it is safe to wait briefly and retry the send, following our best practices for handling 5xx responses:
https://support.sparkpost.com/docs/tech-resources/smtp-rest-api-performance

This proactive maintenance will help ensure a smooth, reliable sending experience throughout the busiest weekend of the year.
Nov 23, 18:05 EST
Nov 23, 2025

No incidents reported.

Nov 22, 2025

No incidents reported.

Nov 21, 2025
Intermittent email api failures impacting EU customers
Resolved - This incident has been resolved.
Nov 21, 05:30 EST
Update - We are continuing to investigate this issue.
Nov 21, 05:30 EST
Update - We have identified the issue and deployed a mitigation; all service functionality has been completely restored.
Nov 21, 05:17 EST
Update - A mitigation was deployed and the error rate is subsiding
Nov 21, 04:49 EST
Investigating - We are currently investigating this issue.
Nov 21, 04:08 EST
Nov 20, 2025
Webhook delays for some SparkPost customers (US hosted only)
Resolved - This issue has been resolved. We apologize for any inconvenience it may have cause.
Nov 20, 13:23 EST
Monitoring - A fix has been implemented and we are monitoring the results.
Nov 20, 12:16 EST
Identified - The issue has been identified and a fix is being implemented.
Nov 20, 11:12 EST
Investigating - Our webhook data delivery services are running behind and some customers may see a delay in data streamed to their webhook endpoints.

Message injection and outbound message delivery is not impacted - all messages are flowing as expected.
Note: This issue does not impact our SparkPost customers hosted in the EU.
Nov 20, 10:56 EST
Nov 19, 2025

No incidents reported.

Nov 18, 2025

No incidents reported.

Nov 17, 2025

No incidents reported.

Nov 16, 2025

No incidents reported.

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