Re: [courier-users] handle spam

[Gordon Messmer]

On 04/09/2016 02:53 AM, SZÉPE Viktor wrote:
> I've just read onhttp://psky.me/
> ...
> How is it possible to implement deferring with Courier MTA?


Before I remove this from my todo list, I wanted to note that I 
attempted to contact the site for clarification on their recommended 
use.  In recommending that messages be deferred, it isn't clear whether 
they mean that messages should be deferred until the listing is removed 
from their RBL (or what the lifetime of such records will be), or some 
other deferral strategy.

I received no response to my query, so I'm deferring any effort to 
implement a module for this RBL.  I'm not sure if the list is even being 
maintained.



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Re: [courier-users] handle spam

[SZÉPE Viktor]

Idézem/Quoting Gordon Messmer :

> On 04/09/2016 09:25 AM, SZÉPE Viktor wrote:
>> Looking at Gordon's greylist.py that would be the "remember" part, and
>> combining it with DNSBL lookup from whitelist_dnswl.py ...
>> but:(  I am not a python developer.
>
> Sounds like another use case for making individual filters conditional.
> It's on my list, but I haven't put a lot of time into that code lately.

Thank you.

An RBL dependent one-time deferring mechanism would be fantastic.



SZÉPE Viktor
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Budapest, III. kerület





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Re: [courier-users] handle spam

[Gordon Messmer]

On 04/09/2016 09:25 AM, SZÉPE Viktor wrote:
> Looking at Gordon's greylist.py that would be the "remember" part, and
> combining it with DNSBL lookup from whitelist_dnswl.py ...
> but:(  I am not a python developer.

Sounds like another use case for making individual filters conditional.  
It's on my list, but I haven't put a lot of time into that code lately.

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Re: [courier-users] handle spam

[Sam Varshavchik]

SZÉPE Viktor writes:


Thank you!

> Defer the message for later.

Could it be that BLACKLISTS defers all messages at all times?


Correct.


He meant to defer a message on 127.0.0.2 reply *once* then accept it.

I think your suggestion will be: "That is possible by developing a
courier filter" because courier has to remember that one defer answer
and accept the message the second time.


Right.



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Re: [courier-users] handle spam

[SZÉPE Viktor]

Thank you!

> Defer the message for later.

Could it be that BLACKLISTS defers all messages at all times?

He meant to defer a message on 127.0.0.2 reply *once* then accept it.

I think your suggestion will be: "That is possible by developing a  
courier filter" because courier has to remember that one defer answer  
and accept the message the second time.

Looking at Gordon's greylist.py that would be the "remember" part, and  
combining it with DNSBL lookup from whitelist_dnswl.py ...
but :( I am not a python developer.




Idézem/Quoting Sam Varshavchik :

> SZÉPE Viktor writes:
>
>>
>> Good afternoon!
>>
>> I've just read on http://psky.me/
>>
>> Response Meaning / Recommended Action
>> --
>> NOERROR  The IP address is question is fine for sending mail.Accept
>> the message
>>
>> 127.0.0.2The IP address in question has been seen with a high rate of
>> spam.Defer the message for later.
>>
>> 127.0.0.3The IP address in question has been seen to have a very high
>> rate of spam.Reject the message at SMTP submission.
>>
>>
>> How is it possible to implement deferring with Courier MTA?
>
> This should be possible by using the settings that are documented in  
> the couriertcpd manual page in the BLACKLISTS settings. Something  
> like:
>
> BLACKLISTS="'-block=dnsbl.example.com,BLOCK/127.0.0.2,450 Go away'  
> '-block=dnsbl.example.com,BLOCK/127.0.0.3,550 Go away'"
>
> Keep in mind that these are shell script fragments, so mind the quoting.



SZÉPE Viktor
-- 
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Budapest, III. kerület





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Re: [courier-users] handle spam

[Sam Varshavchik]

SZÉPE Viktor writes:



Good afternoon!

I've just read on http://psky.me/

ResponseMeaning / Recommended Action
--
NOERROR The IP address is question is fine for sending mail.Accept
the message

127.0.0.2   The IP address in question has been seen with a high rate of
spam.   Defer the message for later.

127.0.0.3   The IP address in question has been seen to have a very high
rate of spam.   Reject the message at SMTP submission.


How is it possible to implement deferring with Courier MTA?


This should be possible by using the settings that are documented in the  
couriertcpd manual page in the BLACKLISTS settings. Something like:


BLACKLISTS="'-block=dnsbl.example.com,BLOCK/127.0.0.2,450 Go away' 
'-block=dnsbl.example.com,BLOCK/127.0.0.3,550 Go away'"

Keep in mind that these are shell script fragments, so mind the quoting.



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