[Exim] 535 Incorrect authentication data

I setup smtp auth yesterday on an old exim 3.36 server.

It worked fine with my testing via pine. (The mainlog showed "P=asmtp".)

But for some reason, a netscape client (I don't know what version yet)
started attempting smtp auth automatically (must have saw it was enabled
when it did "EHLO").

Logs like the following came in repeatedly (every two to eight seconds):

2003-03-14 08:36:24 Authentication failed for
(whatever.foo.bar) [192.168.0.4]: 535 Incorrect authentication data

Over 80 megabytes of these entries.

I was told that the netscape client didn't indicate any errors. I was told
that it appeared to send. (Bad netscape.) Exim didn't accept any emails.
(I am across the world from the client, so I will need to ask more.)

When I saw this a few times, I killed the PID for that process.

Has anyone seen anything like this repeating continuously?

My config is below my signature.

  Jeremy C. Reed
  http://www.isp-faq.com/    -- find answers to your questions

host_auth_accept_relay = *

# exim built with:
#AUTH_CRAM_MD5=yes
#AUTH_PLAINTEXT=yes

# SMTP AUTH for PLAIN authentication
plain:
    driver = plaintext
    public_name = PLAIN
# need to run as root to use pam to authenticate against /etc/shadow
#    server_condition = "${if pam{$2:$3}{1}{0}}"
    server_condition = "${if
crypteq{$3}{${lookup{$2}lsearch{/usr/local/exim-3.3
6/smtp-auth-users}{$value}}}{1}{0}}"
    server_set_id = $2

# SMTP AUTH for Outlook using LOGIN authentication
login:
    driver = plaintext
    public_name = LOGIN
    server_prompts = Username:: : Password::
# need to run as root to use pam to authenticate against /etc/shadow
#    server_condition = "${if pam{$1:$2}{1}{0}}"
    server_condition = "${if
crypteq{$2}{${lookup{$1}lsearch{/usr/local/exim-3.3
6/smtp-auth-users}{$value}}}{1}{0}}"
    server_set_id = $1