on my server are several domains and one of my customers would like to know if it's possible to know if an email sent to her account has been read by someone else.
She has the feeling that someone else is reading her emails - it might be possible because a technican might have had a look at her email and password. If that guy has set up his email client that way that the emails aren't deleted from the server when receiving them, is it possible to know if someone did it like that way?
Are there logfiles who accessed the emails? My client has a static ip address, btw.
We will change the password soon, but before we're going to do this, we want to ensure that no one else than her is reading the mails.