Yea it's a good concern. Right now I only have very simple checks, like captcha, detecting similar messages and also protecting a single email account from getting multiple emails. Feel free to suggest any ideas you might have :)
I see your point. What name would sound better as the email sender (a name is required)?
FeedFeedback is the original app that I built that allows people to easily ask for and get feedback. I added this new feature of anonymous email on top of that.