Privacy tools attract convincing copies. There is exactly one address for this one.
solanamixer.fun (and www.solanamixer.fun, which redirects to it). Anything else is not SolanaMixer.fun, however closely it resembles this page.Cloning a mixer front-end is cheap and the result is convincing, because it is a copy of the real thing. What changes is the deposit address, or the note-generation code — altered so whoever built the clone can reconstruct your note and withdraw before you do. You would find out when your withdrawal failed.
Message you first. Ask for your note by email or chat. Ask for a seed phrase or private key. Ask you to "verify" a wallet by sending funds somewhere. Nothing here could ever legitimately require any of that.