Hi,I’m trying to understand why the first unthrusted mail hop in a received header shows rDNS: unknown, but when I check the same IP manually using dig -x, I do get a PTR record.
Received: from suomenporakaivo.fi (unknown [107.150.1.216])Why would SpamAssassin / Postfix log unknown in this case? Could it be due to a temporary DNS lookup failure, caching issue, or something else? Only two hours have passed since the spam was received.
Best regards, Thomas B
