Update - We have started to receive reports from Microsoft that they are implementing mitigations within their environment. We continue to monitor and coordinate with them for full resolution.
Jan 15, 2026 - 08:49 EST
Jan 15, 2026 - 08:49 EST
Identified - We continue to work with Microsoft on these delays. We are in active contact with their delivery team and working towards full resolution.
Jan 15, 2026 - 08:25 EST
Jan 15, 2026 - 08:25 EST
Update - Microsoft continues to investigate the issue. We are actively in contact with their team.
Jan 15, 2026 - 06:50 EST
Jan 15, 2026 - 06:50 EST
Update - We continue to work with Microsoft on full mitigation. They are currently experiencing infrastructure issues that is causing them to incorrectly block legitimate traffic from multiple Bird IP ranges.
Our sending infrastructure and email traffic are operating normally. All other mailbox providers are receiving mail without issue.
Microsoft is aware of the issue and is actively investigating. We are in contact with their team and monitoring for resolution.
We expect this to be resolved once Microsoft completes their fix.
Messages will retry automatically - no action needed from you
Jan 15, 2026 - 06:13 EST
Our sending infrastructure and email traffic are operating normally. All other mailbox providers are receiving mail without issue.
Microsoft is aware of the issue and is actively investigating. We are in contact with their team and monitoring for resolution.
We expect this to be resolved once Microsoft completes their fix.
Messages will retry automatically - no action needed from you
Jan 15, 2026 - 06:13 EST
Update - Impact is confirmed to be scoped to EU region only.
Investigation ongoing; tickets raised to Microsoft to further investigation.
Jan 15, 2026 - 06:06 EST
Investigation ongoing; tickets raised to Microsoft to further investigation.
Jan 15, 2026 - 06:06 EST
Investigating - We are currently investing reported delays when sending emails towards Microsoft email domains
Jan 15, 2026 - 05:24 EST
Jan 15, 2026 - 05:24 EST
SparkPost Application (WebUI)
Operational
SparkPost Application - USA
Operational
SparkPost Application - EUROPE
Operational
SMTP Delivery (Outbound Message Delivery)
Degraded Performance
SMTP Delivery - USA
Operational
SMTP Delivery - EUROPE
Degraded Performance
Transmissions API
Operational
Transmissions API - USA
Operational
Transmissions API - EUROPE
Operational
SMTP API
Operational
SMTP API - USA
Operational
SMTP API - EUROPE
Operational
Metrics API
Operational
Metrics API - USA
Operational
Metrics API - EUROPE
Operational
Events API
Operational
Events API - USA
Operational
Events API - EUROPE
Operational
Relay Webhooks Delivery Service
Operational
Relay Webhooks - USA
Operational
Relay Webhooks - EUROPE
Operational
Sending Domains API
Operational
Sending Domains API - USA
Operational
Sending Domains API - EUROPE
Operational
Suppression List API
Operational
Suppression List API - USA
Operational
Suppression List API - EUROPE
Operational
Event Webhook Delivery Service
Operational
Event Webhooks - USA
Operational
Event Webhooks - EUROPE
Operational
Engagement Tracking Service
Operational
Engagement Tracking Service (redirecting clicks and serving opens) - USA
Operational
Engagement Tracking Service (redirecting clicks and serving opens) - EUROPE
Operational
Mailbox Provider Service Interruption
Operational
Blocklist API
Operational
Blocklist API - USA
Operational
Blocklist API - EUROPE
Operational
Alerts API
Operational
Alerts API - USA
Operational
Alerts API - EUROPE
Operational
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.