A throwaway address shows up in your signup form. Someone wants the free tier, the download, or the trial, and they have no intention of reading a single email you send. You only find out later, when your open rates sink and your bounce complaints climb. The fix most teams reach for first is manual review. A human scans the address, guesses whether it looks temporary, and decides. That approach does not survive contact with real traffic. This is the disposable email domain problem. A disposab...