Am 03.10.2014 um 22:07 schrieb David F. Skoll: > On Fri, 03 Oct 2014 22:02:59 +0200 > Reindl Harald <[email protected]> wrote: > >> hard to say in general, that are not so much X-Headers > >> i have seen a lot of spam really tagged with such >> headers because some outgoing mailserver had indeed >> a spamfilter and the messages did not reach the block >> score and depending on how many hops a mail takes >> the number of such headers increases > > That's true, but I think if we see headers from multiple vendors, it's > pretty suspicious. Not many sites filter their mail via Barracuda > *and* IronPort *and* KLMS *and* PerlMx *and* ... etc.
true - but the assumption is only corcet if you take the number of Received headers into account, each hop may have his own unconditional filters - qualify if the mail-route at all is suspect may become error-prone
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