The UI is straightforward and intuitive, so it only took about 3 seconds to figure it out what is happening, what needs to be done and how to do it.
There were moments where emails would spawn on top of each other, which would briefly slow down what I was intending on doing if a spam and non-spam email happened to overlap.
I think the core mechanic is perfected at this point, so it would be interesting to see how you would expand on this concept further.
A fun delegation simulator.