This issue has been resolved. We have also worked with Proofpoint to take several measures to help mitigate recurrence of similar issues in the future.
Posted May 08, 2018 - 15:09 EDT
Since Proofpoint's delivery failover test this morning that resulted in some message queueing, Proofpoint has had a subsequent problem delivering email to the proper back-end email servers at LuxSci. This has been causing some additional intermittent delays for some messages. We are pushing hard for resolution to this issue.