We are using Exchange enviornment, however orion alerts points to an outside web service "mail.messaging.microsoft.com" and is never making it to our exchange enviornment.
" The transport error code was 0x800ccc67. The server response was 421 4.3.2 The maximum number of concurrent connections has exceeded a limit, closing transmission channel.".
I found that error as well when googling the error code. After examining some of current alert headers we think we are a track that leads to a dns problem in our own network but we wanted to see the failed emails to try and get more information but I can not seem to locate them in any kind of trash file.