07:50 October 9th, 2019 - 09:49 October 9th, 2019
Incoming email process was delayed
Upon further investigation we determined that a critical service for mail processing had stopped whenever it tried to process a particular message.
Removing that message allowed for the remaining queued messages to be processed. While trying to reproduce the root cause in a lab environment using the original malformed message, our engineers were unable to cause mail flow to stop. We have continued to monitor mail processing for the past 14 days and the issue has not returned, and are working to improve filtering mechanisms in order to bypass messages with apparently malformed header information.