This question relates to an answer on Skeptics.SE. Read the comment where somebody wrote "Even if you forward someone the email you received, we can't be sure you didn't fake it." Is this statement true?
Let's say that Stack Exchange sent me an email and I have no reason to doubt the email is fake and not from Stack Exchange. I want to show my friend that I received an email from Stack Exchange, but cannot physically show him/her the email. If I forward the email to my friend, will he/she be able to independently verify that the email is indeed from Stack Exchange?
Equivalently, is the statement "If you forward someone the email you received, we can't be sure you didn't fake it." a true statement?
I know that there are questions on spoofed emails. This one is specifically asking about forwarded emails and checking whether or not they are spoofed.
My interest in this is not purely hypothetical (although the described situation is). If you are really interested, read the comments here.