Steps to reproduce:

1/ User sends me a message with spam in
2/ I recieve email of the spam and declare it a spam
3/ I login to moodle and get the message pop indicating I have a new message
4/ I block the user and dont read the message

Actual result:
Now every time I login I get messaging popup without any messages, and it is slow and unintuitive to find the user, unblock them and read the message.

Expected result:
Never hear from user again, and dont get popup