https://issues.apache.org/SpamAssassin/show_bug.cgi?id=6508

--- Comment #3 from Mark Martinec <[email protected]> 2010-11-04 19:56:51 
UTC ---
> In my experience this has been an important feature.
> I know of a number of people that have setups like this:
>   trusted_networks 10.20.30.0/24
>   internal_networks 10.20.30.0/24 !10.20.30.2/31
> Where the /24 covers their MXes and the /31 covers their MSAs.

The above produces a lint warning:

$ spamassassin --lint
warn: netset: cannot exclude 10.20.30.2/31 as it has already been included

Similarly, of the six failing test cases in trust_path.t all but one
produce a lint warning (if I counted correctly). The remaining one
is perhaps questionable or maybe a lint test can be added.

We have been telling people they cannot expect flawless operation
in presence of lint errors or warnings. Following a principle of
'garbage-in, garbage-out', maintaining backwards compatibility with
invalid setups is not always necessary or possible, especially
when warnings _are_ being issued.

But I agree the concept of these three sets of networks is hard
to understand and may not even be applicable to every topology,
so any hand-guiding in a form of documentation with examples
and warnings is more than welcome.

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