In my application package, I did a lot of email print outs and submitted in as evidence.
For my interview, I was debating whether or not I should do more of those print outs but instead, I have put all my emails between my partner and I in a folder and I will print out the logs. I may or may not print one or two of those emails out.
We keeping replying to the same email back and forth each day and I save the last response I get from him. So, for a daily email we are looking at about 5-10 pages alone in conversation.