On Sunday, November 02, 2003 8:13 PM, Robert Menschel wrote:
> It seems likely that any X-{random string of characters} header is for
> spam tracking purposes only. I wonder whether a test for an X- header
> name with four or five consecutive consonants would be a valid spamsign
> test.
In at least three cases, this is would yield false positives. Among various
other things, our webmail adds a X-NNTX-CameFrom-IP field to outgoing
messages from our users. We also append X-NNTX-Spam-* fields for incoming
messages that could then be re-spamassassined by the end user, which would
generate a false positive.
There are also several Challenge/Response Systems that use random 64-512bit
X- headers for an extra level of identification.
Jeremy Kister
www.jeremykister.com/jeremy/
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