OS users for clients are quite cryptic and it would be helpful if the client identifier were a suffix and not a prefix. If the id was also comprised of the client's primary domain then it would be even clearer for the end-user. For example, instead of 'web1_john' it could read 'john_example_com' which is not too far from '[email protected]'. Such an arrangement would also hide how many clients the ISP has.
