Our operations team was able to implement several backend enhancements to alleviate delayed email stat synchronization and improve performance moving forward. At this time we are no longer seeing delays in any region. Please contact our support team should you need any further assistance.
4pm UTC 3/31/2017
We are receiving reports from clients in all regions of delays in email events writing back. Our operations team is currently investigating this as a critical issue and we will post back here as we know more. Note that actual send processes are not impacted at this time. We apologize for any disruption this may cause and hope to have this resolved soon.