Nice looking game we have here! Unique with the idea, I have seen this one first on here. I like the art-style very cozy.
There isn't much gameplay not so much detective work cause the most spams are easy to detect, would been nice to add something like the wrong email (not offical one) so you put in your notes like real emails. and look at them in that way. It would been nice to have the notes or even pictures also been used to detect spam email.
But maybe that's for feature if you guys wanna work further upon it. Overall very nice game well done!