E-mail sent by Discourse marked as spam (IPv6 reverse DNS missing)?

community.openstreetmap.org sends me e-mail notifications when topics I follow change, however it ends in spam. The main reason (from which all of others problems derive), seems to be that while envelope-sender is valid VERP to catch bounces (e.g. replies+verp-xxxxxxx@community.openstreetmap.org), the From: header field is set to e-mail address community@noreply.openstreetmap.org whose FQDN seems not to have valid FCrDNS for its IPv6 address (but has is only for its IPv4 address).

  • Working IPv4 FCrDNS:

    % host -t mx noreply.openstreetmap.org
    noreply.openstreetmap.org mail is handled by 10 a.mx.openstreetmap.org.
    % host a.mx.openstreetmap.org
    a.mx.openstreetmap.org has address 212.110.172.32
    a.mx.openstreetmap.org has IPv6 address 2001:41c9:1:400::32
    % host 212.110.172.32
    32.172.110.212.in-addr.arpa domain name pointer shenron.openstreetmap.org.
    % host shenron.openstreetmap.org
    shenron.openstreetmap.org has address 212.110.172.32
    shenron.openstreetmap.org has IPv6 address 2001:41c9:1:400::32
    
  • Failing IPv6 FCrDNS

    % host 2001:41c9:1:400::32
    Host 2.3.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.4.0.1.0.0.0.9.c.1.4.1.0.0.2.ip6.arpa not found: 3(NXDOMAIN)
    

Could someone please add correct reverse DNS records for IPv6?

4 posts - 3 participants

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Ce sujet de discussion accompagne la publication sur https://community.openstreetmap.org/t/e-mail-sent-by-discourse-marked-as-spam-ipv6-reverse-dns-missing/1238