I was trying to convince an ISP that they should not be recycling emails for prior customers. They seem to think it was not an issue but I told them they were mistaken.
I tried to express that by giving out the old customers email they were allowing the new person to perform things like password resets or even receive email that was suppose to go the orginal account owner.
In the end I got them to revoke the email they reused and make sure it is never given out again.