Wietse Venema: > By itself, dnsxl maps may be useful in contexts that perform "list > membership" lookup such as smtpd_client_event_limit_exceptions, > where the lookup result value is ignored, For example, to prevent > password brute-forcing from bot-infected systems: > > smtpd_client_event_limit_exceptions = dnsxl:xbl.spamhaus.org
Except that this does not block AUTH commands. Currently all that
smtpd_client_event_limit_exceptions does is not announce AUTH support
in the EHLO response.
Wietse
