Ok I’m not going to speak specifically and as I am not a hacker this information may not be totally correct. But this is what I have learned in computing.
Email clients use keys to encode the emails, it’s all done automatically.
Everyone has a public key and a private key.
Lets do some role-play. We have person a and person b.
Person a is sending the email to person b.
A's message is encrypted using b's public key, and it can only be decrypted using his b's private key, which only he/his email client knows.
So lets say person c intercepts the email, he can only decrypt it if he has person b's private key. I think there probably is software to get the information.
I have a feeling that possibly what I have just explained is only on networks.
If his computer is on the same network as her, it is fairly easy to intercept the message, you can have programs that instead of rejecting all the information sent to it, it records it all.
If your friends ex-husband knows her password he can obviously check the emails.
Most email clients have a password + secrete question. Make sure your friend changes both, to something that her ex can never know. Because if he knows the answer to her secrete question he has the power to change her password.
If I have said anything unclear, please reply and I will try and be more clear.
Venney
