P.S. I wrote:

> For a couple months some spam

with fake Received

> penetrated greylisting (I think that only one
> Russian botnet uses same $sender_address in all instances of same spam
> necessary for penetrating greylisting), but if I'm not mistaken,
> for last couple weeks that botnet switched to no fake Received line at all.

but with other recognizable signs in the header. I'm testing
a new complex set of conditions.

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