The Electronic Signatures in Global and National Commerce Act (ESIGN), along with the Uniform Electronic Transactions Act (UETA), makes electronic signatures legally binding. Under the act, any electronic signature can be binding if:
All parties record an intent to sign the document.
All parties agree to sign electronically.
The signature is recorded electronically.
The signed document is retained and reproducible by both parties
Faxes signed by eFax are able to satisfy all four of these requirements.