Am 09.06.2014 22:17, schrieb johnea:
> On 06/09/2014 11:48 AM, Wietse Venema wrote:
>> 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.
> 
> Is it possible to use this to DNSBL check URLs present in the body of an 
> email? (pre-queue)

postfix is a MTA and only a MTA which is good
one tool one job

you can plug contentfilters but that's not the job of postfix itself

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