I can't see the user's email whether it is in reports or in their profile. I'm not sure about global mods though, it might be different for them.
I can't find that post, but I'm pretty sure @hilariousandco has confirmed that he doesn't see the email addresses of users who have reported a post. I’m not sure when he became a global mod, but back in 2014 he was at least a mod or part of the staff when he wrote the following :
Only certain mods can see it - I can't for instance - but I agree that if it doesn't need to be there then it should be removed.