Just found out a few months after updating from Build 8930 > Build 9294 that custom Events we had configured stopped sending out email notification. Didn't test it on a newer version but don't see any mentions of Events being fixed in the release notes.

We have various custom Events set up to email domains admin when their domain storage reached x%, and these stopped working. Customers were instead met with the Domain Exceeded system notice when it is too late and mail is already interrupted.

After some testing and turning on the Events log we found that the cause is the 'From Address' action field. Before we had this set as 'Mail Administrator'. The log showed events being triggered but no mail notice was generated.

Once that field was changed to an actually email address the notifications are working properly again.

If that is a new requirement it perhaps should have been noted in release notes or the fields should have been updated as part of the upgrade. It also worth noting this field defaults to 'admin' when creating a new Event, which also does not work and shouldn't be allowed to save as such.

For uniformity sake perhaps this should be changed to 2 fields like System Messages, leave blank for default 'noreply@' and customizable Display Name.