https://issues.apache.org/SpamAssassin/show_bug.cgi?id=6724

--- Comment #4 from Matthias Leisi <[email protected]> 2011-12-13 15:35:55 UTC 
---
(In reply to comment #2)

> Matthias, are you able to block/return no answers or return a last octet of 
> 255
> as a blocked answer.  And NOT return purposefully wrong answers?

Technically, we can return whatever rbldnsd can return, ie any A value. 

> ifplugin Mail::SpamAssassin::Plugin::DNSEval
>   header  RCVD_IN_DNSWL_BLOCKED        
> eval:check_rbl_sub('dnswl-firsttrusted',
> '^127\.0\.\d+\.255$')

I would prefer an occasional lookup to "blocked.example.org" (or even
"status.example.org" returning a number of HTTP-like status codes), but I agree
with the comment made elsewhere that it takes non-trivial amount of code to
implement this. 

As a second-best solution, the ..._BLOCKED is probably OK. Just the last octet
as 255 is possibly not very unique for other lists. Would 127.255.255.255 stand
out more? 

>   tflags RCVD_IN_DNSWL_BLOCKED         nice net

Possibly also avoid autolearning?

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