Dose G/pgp plugin perform clent to clent email encryption

sorry, if the question has been already answered....

i want to know whether openpgp plugin of squirrelmail perform clent to client encryption (excluding the encryption done if ssl in used to connect the client and server) like in hushmail..... or the encryption is performed on the server on which squirrelmail is running.

i tried to find the answer through books and google but i failed... so i have posted it here..

thanks in adv.