500 error when accessing sender authentication validation endpoint

Our engineers have monitored the fix and confirmed the issue with sender authentication throwing 500 errors when attempting to access the validation endpoint has been resolved. All services are now operating normally at this time.

Our engineers have implemented a fix and are monitoring system performance. We will provide another update in an hour or as soon as more information becomes available.

Our engineers have identified the problem and are making progress towards a resolution. We will provide an update in four hours or as soon as more information becomes available.

Our team is closely monitoring the system's performance. The mitigation process might take longer than usual. We will provide an update in four hours or sooner if we have more information.

We are continuing to monitor system performance. Due to the current volume of requests, mitigation may take longer than expected. We will provide another update in four hours or as soon as more information becomes available.

Our engineers have identified the root cause, and implemented a fix and are currently monitoring system performance. At this time, we are closely watching the volume of requests to the sender authentication validation endpoint's queue to ensure it continues to decrease and that the issue mitigates. We will provide another update in an hour or as soon as additional information becomes available.

Our engineers have identified the issue and are working toward a fix. We will provide another update in hour or as soon as more information becomes available.

Our engineering team is continuing to investigate the issue. We will provide another update in one hour or as soon as more information becomes available.

Starting around 3:17 pm PDT on 7/31/2025, our engineers began investigating an issue impacting the sender authentication validation endpoint. Some users may experience an elevated number of 500 errors when attempting to access the sender authentication validate endpoint. This does not impact Mail Send. We will provide another update in 1 hour or as soon as more information becomes available.