Slack integration should never show email address of anonymous idea submissions

My idea form allows users to submit ideas anonymously, and then it notifies our user community slack channel. This prompts great discussion and votes on good ideas. My problem is that even though someone submits the idea anonymously, the user’s email shows up in the public slack channel. I want to turn that off. I imagine the intent with slack notification was for an ‘internal’ slack notification, but I use it for community discussion.