[Dovecot] what best for anti-spam filter?

[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