Disable Users from Accessing qmail Messages

I have a Solaris 2.8 server running qmail 1.03 for about 1100 users.

I want to specifically target certain user accounts from being able to access their Mailbox but I do NOT want to impede them from receiving messages.

I need to be able to disable a user from telneting into the server, using any of the installed web mail interfaces:  Roundcube, IMP/Horde,  and Twig, or getting their e-mail messages using their preferred mail client that is set up for IMAP or POP3.

Again, these users MUST continue to receive messages stored in their Mailbox but may NOT access them.

How would I accomplish this feat?
DrRichardAsked:
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