Am Di, den 03.02.2004 schrieb Meng Weng Wong um 17:47:
The first step would be to go over the logs and do SPF lookups after the
fact. We need code that will parse maillogs from several formats and:
- measure the DNS cost of SPF-testing millions of messages
- figure out the false positive rate
- figure out the false negative rate
- find out who the evites, the hallmarks, etc are
- uncover any unexpected problems
- etc
How can the positive/negative rate be tested?
If you have a good spam/virus filter a filter that runs after
SpamAssassin could dump the results of the spam/virus detection and the
Received-SPF line to a log file.
A script could then collect the data, sort and count.
False positives would be non-spam/virus with SPF fail/softfail/neutral
False negatives would be spam/virus with SPF pass (unknown?).
These false detections could then be analyzed further.
SPF none would then be the rest.
Something like that?
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