Hello,
As of October 28th, it appears all of our customers have stopped receiving notifications from the system. Nothing has changed in terms of permissions or notification settings in the system. Doing some research, it may appear like our customers domain (or all of the configured customers emails individually) are on the suppression list. I don't seem to be able to contact JIRA technical support in any other format other than asking a question to the community. I'm hoping someone from JIRA is able to see this and reach out to me directly to get more specifics on the domain/emails to check the suppression list.
Thanks,
Rick