[exim] POP3 authentication

Hello,
I have a question for them.
It happens that the configuration that authenticates the user with a good connection on POP3, when done in an organization, malicious anyonecan after a successful connection, change the configuration of your mail client and send mail as another person correct.
Is there any way to fix this in a shared environment? (I hired a shared hosting plan)

Thank you very much for your comments.


Pablo Baldovi
pbaldovi@???