unknown rDNS
"Thomas Barth via users" <[email protected]> Sat, 08 Nov 2025 14:35:55 +0100
| Newsgroups | gmane.mail.spam.spamassassin.general |
|---|---|
| Message-ID | <[email protected]> |
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