I would print out and save that e-mail along with all the information that showed where it came from and when. If the electronic copy was lost due to a glitch further down the road........
Ditto!
I ship frozen gamefish all over the country as far away as Hawaii (just shipped some bluegills to Sun Valley, California) and have sent out written forms to inquire about the legality for doing so in all 50 states.
I've had a few instances where law enforcement officers and biologists disagreed with each other. I had one special agent refuse to answer my questions because he said, "You're going to break the law anyway." Even had a conservation officer tell me it was illegal in Virgina because so and so code said it was. When I proved to him the code was no longer valid and had been replaced with one that made it legal the following year (thanks to a fish farmer telling me so from the same state) he refused to budge.