If they refuse it, I think it's generally because they _know_ you're filtering them, and don't want you to sign up with a single-use address. In which case I do

If they refuse it, I think it's generally because they _know_ you're filtering them, and don't want you to sign up with a single-use address. In which case I don't bother signing up because I know they'll be spamming. Also, there's always https://mailhero.io/ https://mailhero.io/