Some of our users had defined personnal email notifications rules, but recently we have put in place system wide email notification practices using the notification rules of the "All Users" group
Yesterday, a developper commited a couple of changes that "turned" maybe 25 build config from green to red. But he received only 3 emails.
I looked at the log files on the server to try and learn a bit more about the email notification mechanism but learned nothing. Was there a problem with the email server on our side or did the TeamCity server determined that this was going to be too many emails, and hence decided to send only a few?