Nothing in NAC Title 437 is intended to or shall be deemed to invalidate or decrease the legal force and effect of any:
i. electronic mail message or file transmitted via any electronic means, including the internet, or physical file transfer, whether or not the such message includes a human-readable name purporting to identify the sender or author, even if such message has no signature of the type mentioned in Chapter 4 of this Title; orii. electronic mail message or file transmitted via any electronic means signed, endorsed, or otherwise validated pursuant to a pre-existing trade agreement between the parties; oriii. digitally signed communication, or other message, a signature on which is valid under other applicable law.437 Neb. Admin. Code, ch. 2, § 002