On Fri 26/Jul/2013 22:08:58 +0200 Anders wrote:
>
> By chance I compared the dkim=fail against what SpamAssassin said:
>
> ====== courier log
>
> Jul 26 21:45:47 e350 courierfilter:
> zdkimfilter[12888]:id=0000000000C804FC.0000000051F2D1E6.00003235:
> verified: dkim=fail (id=@dkim-reputation.org, body hash mismatch,
> stat=1) rep=0
>
> ====== SpamAssassin log
>
> Jul 26 21:45:43 e350 spamd[19824]: spamd: processing message
> <5873b4b23ff3d57de56472c8c0240...@www.dkim-reputation.org> for mail:8
> Jul 26 21:45:47 e350 spamd[19824]: spamd: clean message (1.8/5.0)
> for mail:8 in 3.8 seconds, 14419 bytes.
> Jul 26 21:45:47 e350 spamd[19824]: spamd: result: . 1 -
>
> BAYES_50,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HTML_IMAGE_ONLY_16,HTML_MESSAGE
>
> scantime=3.8,size=14419,user=mail,uid=8,required_score=5.0,rhost=e350.lan.lechevalier.se,raddr=127.0.0.1,rport=48478,mid=<5873b4b23ff3d57de56472c8c0240...@www.dkim-reputation.org>,bayes=0.499952,autolearn=no
That's an unusual result. It might happen that a message gets
corrupted, an subsequent verifications fail. The other way around is
very unlikely.
> What does body hash mismatch mean? Perhaps there are some headers not
> checked by SA but are checked with zdkimfilter?
The body hash is SHA-1 of the body, ignoring empty lines at the end of
it ("simple" hashing algorithm). Zdkimfilter assumes Unix-style line
endings and reinserts CR chars at line ends.
> Spamassassin is run through pythonfilter-1.8. I believe pythonfilter
> might be run first as it is doing greyfiltering.
Does it alter the body?
> Are the added headers from SpamAssassin the culprit?
Nope. The signed header fields are those indicated by the h= tag. In
this case: to, subject, date, from, reply-to, message-id, mime-version,
and content-type.
back later...
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