Delivery to Microsoft has returned to normal. Thank you for your patience as we worked with them regarding this.

We've received word from Microsoft that they've addressed the cause of the bounces. While it may still be possible to see emails in the Delivery Delayed status while we wait on retry, newly sent emails are now Delivered.

We're continuing to investigate the causes of Deliverability Delayed events with Microsoft and working with them directly. Thank you for your patience as we investigate this.