Maybe.. and maybe I'm just being sensitive, here. I don't get the thinking of keeping an email account accessible for his wife. If there's nothing to hide and there's no hidden motive, deep down, then it's best to share these conversations with our loved ones, rather than planting access, so they can find it for themselves.

If I were in his situation and my spouse expressed concerns, at the very least I would ask them if they were interested in reading the emails together.. and even that can be seen as accusational that they're being paranoid for "no reason at all".. so I'd more likely have open conversations, instead. Be transparent.

I also wouldn't share something that could potentially hurt my spouse, knowing it had zero grounds of concerns. We can't control what others say and do but we can definitely navigate through a situation, keeping our loved ones in mind.