We're marking this as resolved. Apologies for any inconvenience caused.
Monitoring
Monitoring
We have identified the issue and rolled out a fix. We're starting email sending again and will be monitoring the issue for a while.
Investigating
Investigating
We have investigated an issue in the handling of email templates which we are working on fixing. We have shut down outgoing emails for now until we a fix ready.
Update in 15 minutes.