We've recently taken measures to better secure the elastic.co domain in regards to email deliverability. In order to consolidate and secure DNS records, be aware that the automated emails coming from Discourse no longer come from discuss.elastic.co but elastic.co.
Note that you may need to update appropriate email filters due to this change, and you should check your spam folder for any messages that may have been filtered out during this transition. We apologize for any inconvenience.