Originally Posted by falko
Then I guess you're using system users. The system users are stored in /etc/passwd and /etc/shadow.
No, I don't think so. I've checked the those folders and there is no such users. I think its using virtual domains and virtual users as MatrixSA is a webhosting CP, so I guess its stored somewhere.
Only tips given by me by the Tech Support was to read up on courier-config and to use that Courier API to change the user passwords. I have no idea what that means.