[Exim] SMTP AUTH, relaying and MySQL

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Hi, I'm trying to set up Exim(4.01) to allow relaying only for local
machines and for authenticated users.
I've added this to my config.
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hostlist auth_relay_hosts = *

login:
        driver = plaintext
        public_name = LOGIN
        server_prompts = Username:: : Password::
        server_condition = ${lookup mysql{select if(count(*), "1",
          "0") from mailusers where id = '$1' and base64 =
          '$2' and can_send = 'Y'}}
        server_set_id = $1
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Does it seem right?

When I run exim -bV I get this errormessage
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root@solpc-01 /etc/exim #exim -bV
Exim version 4.01 #3 built 17-Apr-2002 21:46:58
Copyright (c) University of Cambridge 2002
2002-04-18 11:48:04 Exim configuration error in line 583:
auth login: cannot find auth driver "plaintext"
root@solpc-01 /etc/exim #
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Any clue to why exim doesn't like plaintext driver?

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hson
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