[exim] PLAIN authentication and Outlook Express

I'm using the following authenticator, it works perfectly fine using
Thunderbird as a MUA but not from Outlook Express. I'd seen hints the
documentation that perhaps the server_prompts string was critical but
I've changed it to the recommended prompt and still no luck.

Is there I way I can have exim dump the SMTP session so I can see what's
going on here?

James

ldap_plain:
        driver = plaintext
        public_name = PLAIN
        server_prompts = Username:: : Password::
        #server_advertise_condition = ${if eq{$tls_cipher}{}{}{*}}
        server_condition = \
                ${\
                        lookup ldap { \
                                user="${lookup ldapdn
{ldap:///dc=jolt,dc=co,dc=uk?dn?sub?(uid=${quote_ldap:$2})}}" \
                                pass="$3" \

ldap://localhost/dc=jolt,dc=co,dc=uk?uid?sub?(uid=${quote_ldap:$2}) \
                        }{yes}fail \
                }
        # value for $authenticated_id
        server_set_id = $2

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