[Dovecot] what best for anti-spam filter?

[Robert Schetterer]

Am 24.07.2012 10:22, schrieb fy:
> 于 2012/7/24 15:16, Arnaud Abélard 写道:
>> On 07/24/2012 06:49 AM, Noel Butler wrote:
>>> On Tue, 2012-07-24 at 11:58 +0800, fy wrote:
>>>
>>>> what anti-spam for you used ? dspam?spammassian? amavisd-new ? what is
>>>> best ?
>>>
>>>
>>> amavisd-new with spamassassin and anti virus scanner, clamav with
>>> sanesecurity rules
>>> use enforcing rules in mail server, like block hosts with no DNS/rDNS
>>> Enforce SPF, publish SPF with hardfail
>>> use DNSBL's in your mail server, spamhaus, spamcop, spam.sorbs, and
>>> more etc.
>>> milter regex to stop dynamic/suspect hosts
>>
>> And first of all, even if this is not dovecot related, use a
>> greylisting solution.
>>
>>>
>>> There is no one solution, the solution, is a box of many tricks
>>> You might get the odd false blocking, but if system opers can not be
>>> bothered running a compliant network with standardised naming
>>> conventions for servers, then it is not my problem, and we have had very
>>> very very few complaints about this type of policy in over a decade. If
>>> someoine sooks to you, educate them, dont whitelist them.
>>
>> Indeed! Fighting spam is a continuous task. While greylisting will cut
>> down the amount of spam by more than 50%, the remaining 50% will give
>> you the hardest time and will keep changing to bypass your rules.
>> You'll need to keep an eye on the flow of false negatives or false
>> positive you are getting...
>>
>> We (72,000 mailboxes) are currently using amavisd-new with
>> spamassassin and CRM114 via a custom plugin instead of the default
>> bayesian filter. Also like Noel, we're using DNSBLs, SPF (although we
>> had to publish a permissive record since some of our users are using
>> their ISP smtp instead of our own).
>>
>> Arnaud
>>
>>
>>>
>>>
>>
>>
> try slockd ,it is a policy server for postfix
> http://www.extmail.org/download

sadly there is only poor english info


-- 
Best Regards
MfG Robert Schetterer