I am curious as to the content of these emails.
Not for personal sick thrills..
But what one considers 'innapropriate' ,the next one might not.
I am sure your feelings are tainted by the fact that it is an old b/f from highschool, and it could make anything sound ' wrong'
are they discussing SEX?
'Old' times? Friends? How they used to talk to each other?
Or are they talking about thier sex lives now ?
HOw they could meet?
How they miss each other?
My first concern is that you are looking so hard into your wifes private space.
Email is just email.
If there are no flight plans, then she is free to speak as she chooses to whom she chooses.
I am married, and I flirt. Sometimes quite openly.
But .. it is just that.... flirting. Simply because I am married, does not mean that I am not a sexual being.
I still find other people attractive.
I still think about old lovers.
I still fantasize about strangers.
That doesnt make me a cheater. And it definatly doesnt mean i WILL ever cheat either.
Are the letters just flirting and nothing else?
Or are they explicit?
And, if you did approach her, and you thought of a great way to explain how you found out.... what are you going to ask her to do?
Stop emailing him?
I am not so sure that is a great option as she is a grown woman.
But if it makes you that uncomfortable ( not being rude....) then stop reading them.
By reading them you are asking for information you dont want to handle.
She isnt going any where. Obviously.
( I know this sounds like a rude post, but I am not trying to be rude with my responce. Just giving my opinion )