Hi, I have stopped receiving mails from openSUSE mailing lists some time late on Monday. The issue is that the HELO hostname sent by the machine does not resolve anymore: 2023-08-22T11:15:53.721108+02:00 nuss postfix/smtpd[4123954]: NOQUEUE: reject: RCPT from proxy-nue1.opensuse.org[2001:67c:2178:8::145]: 450 4.7.1 <anna.infra.opensuse.org>: Helo command rejected: Host not found; from=<factory-bounces@lists.opensuse.org> to=<nik@naturalnet.de> proto=ESMTP helo=<anna.infra.opensuse.org> DNS has this to say: ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 512 ; EDE: 22 (No Reachable Authority): (At delegation infra.opensuse.org for anna.infra.opensuse.org/a) ;; QUESTION SECTION: ;anna.infra.opensuse.org. IN A My guess is that something was migrated somewhere or renamed, and someone forgot to adjust the HELO hostname ;). Cheers, Nik