On 30 Aug 2018, at 18:02, Grant Taylor wrote: > On 08/30/2018 03:50 PM, Bill Cole wrote: >> That will depend on how that particular MTA constructs its Received headers >> in relation to the parsing in >> Mail::SpamAssassin::Message::Metadata::Received, which is non-trivial to >> describe in human language. > > Fair enough. > > Would it be possible for this scenario to present with the symptoms that the > OP described?
I don't think so, given the description, but maybe. Mail::SpamAssassin::Message::Metadata::Received implements a baroque ad hoc parsing mechanism that has been adapted organically for most of 2 decades and which "knows" many special cases where a particular Received header pattern indicates a trusted hand-off. My understanding is that the client lacking rDNS in this case is talking directly to the SA host, which is a simpler case. > Thank you for humoring me as I try to learn. No problem. I make no claim to knowing absolutely everything about how the *_networks and Received header parsing behaves, or even to know better than anyone else in particular, but I've fought with it a bunch...
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