Email Delivery Issue to Proofpoint

We have monitored the service for stability and this incident shall now be closed.

We are no longer experiencing issues connecting and delivering emails to Proofpoint. We will continue to closely monitor the email traffic and provide updates as more information becomes available.

Our initial investigation shows Proofpoint is permanently rejecting our email connections due to some block on their side. We continue to experience issues delivering emails to Proofpoint.

We are in the process of connecting with Proofpoint through various channels, we request customers to do the same. We will continue to provide updates as more information becomes available.

We have identified that Proofpoint is blocking our IP range and emails processed by our infrastructure are being rejected, hence there are no emails being queued for delivery.

We are working with Proofpoint to address the situation. We will continue to provide updates as more information becomes available.

We are currently experiencing issues delivering emails to a small subset of customers/recipients using Proofpoint service. The result is that emails processed by our infrastructure are queued for delivery. Our investigation shows the issue is occurring due to Proofpoint throttling our IP range. Any existing email will remain queued till the throttling is cleared. Please note that there is no impact to protection services, and all other aspects of our services remain functional.

Customers are requested to whitelist Symantec IPs using Proofpoint solution. We will provide updates as soon as new information is available.