It might be worth checking with spamhaus that your mail server is not flagged for sending spam. Pretty sure you specify an account for the "from" when using 0365 instead of impersonation. If it did work and nothing changed with papercut it would point to a config issue
It would be worth comparing it to other job ticketing products. Given the recent updates the feedback has been good, there is also a low-cost mini lab option from memory as well.
Hello,
Correct you can't change trays, that would need to be set at time of print. Can't you continue to print to the device box and still track them?
Have you checked that the scan is unencrypted? do you mean in delivery?