Take an address, use it wherever you'd rather not hand over your real one, and watch the mail land here. Everything is deleted when the clock runs out. No signup for the inbox — an account is only needed for API keys.
Pick any name you like or get a random one. It exists the moment you claim it.
The inbox checks itself every few seconds. Nothing to install, nothing to configure.
After an hour the address and every message in it are deleted for good.