This is the way we can prove that a message from future is real.
Everyday a special random ID is created, it has 24 hours life. If a “time traveller” or future digital communication exist we can check them consulting past identifiers (they are future identifiers for us) in the ID list. We verify the “message from future” checking the current ID. We also analize that mail to prove that it’s not a security fail or coincidence.

Are you a time traveller? PROBE IT!!!!!!