t_backoff wrote:Without even bringing upt the moral aspect of this subjet, any Administrator with DB access can theorectically read user's PMs. If you are looking for an ACP module to read PMs, this would require a MOD, and I am not aware of any available at this time.
As t_backoff mentioned, anyone with database access can theoretically look at the private messages table and filter by user to read conversations.
There is currently a MOD that gives this functionality that is called Private Message Moderation
However, before using this, I suggest that you inform your users that you have the ability to view their private messages (so their messages are not completely private). Otherwise a lot of issues could pop up. I also suggest only using it in the case of a serious issue arising, not just so that you can browse anyone's private message. After all, they are meant to be private (as private as something put on the internet can be, anyway).