As of 11AM, the messages that were delayed in our Dallas DC have been processed and delivered. All other data centers processed mail without an issue.
Update 02/07/2020 15:51 PM 7 days
As of a few minutes ago all the new mail is going through the load balancers without delay, the mail that was delivered to nodes that were experiencing DNS/latency issues in Dallas is being processed at the moment and will be delivered in a few minutes.