On Sun, 15 Jun 2008, Russell Bell wrote:
>     dkim-filter writes 'X-DKIM: Sendmail DKIM Filter v2.5.5 ...' to the 
> header of every message we receive but makes no entry in the log for the 
> vast majority of them.  For some it records 'no signature data'.  Those 
> messages have no signature data but many more without signature data 
> result in no entry in the logs.  I turn on logging for all events in 
> dkim-filter's configuration.

If you've asked for X-Header service, it will add that header to all 
messages it sees (except those excluded by "-a"/"PeerFile") as a rubber 
stamp that the message was processed by the filter.

The "no signature data" is logged if the DKIM library reports the message 
was unsigned.  If the filter never got that far, instead, for example, 
deciding the message can't be processed because it was malformed in some 
way (e.g. missing required headers), then it never gets far enough in the 
code to make that decision, and it doesn't get logged.

If you can give me an example of a message which causes the logging and 
one which doesn't, I can be more precise.

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