IANAL but I expect emails are only evidence to the extent that the other party acknowledges (or at least, doesn't object to) their veracity. If they do object,

IANAL but I expect emails are only evidence to the extent that the other party acknowledges (or at least, doesn't object to) their veracity. If they do object, then you can have fun tracking down logs and stuff. Of course, that's also just text, so if that's called into question, you start questioning the people involved in maintaining the logs, etc, and trying to figure out which story is more plausible. So in short, what courts do on a daily basis anyway. All evidence is circumstantial to some extent.