I intend to move into a rental home and the landlord filled out the lease and signed it, then scanned it and emailed it to me. Is the lease valid? Does it become valid as soon as I print it and sign it?
When you're walking into civil court, any paper signed by some third party must have some kind of attestation. i.e. it should be notarized or witnessed by some recognized authority. A faxcimile of that is typically acceptable...i.e. the original document is good to have, but if everyone agrees that the copy is of a valid attested document, then it's all good.
The practices of the courts are in transition with this, as we move into a paperless society.