Gmail has detected that this message does not 550-5.7.1 meet IPv6 sending guidelines

Discussion in 'Installation/Configuration' started by muekno, Aug 6, 2025.

  1. muekno

    muekno Active Member HowtoForge Supporter

    Gmail has detected that this message does not
    550-5.7.1 meet IPv6 sending guidelines regarding PTR records and
    authentication 550-5.7.1 . For more information, go to 550 5.7.1
    The mailserver is configured with ISPConfig an uses IPv4 only.
    What can, must I do

    Thanks for any help or hint

    Regards

    Rainer
     
    muekno, Aug 6, 2025
    #1
  2. pyte

    pyte Well-Known Member HowtoForge Supporter

    Sure about that?
    What does `postconf | grep inet_protocols` output on the mailserver?
     
    pyte, Aug 6, 2025
    #2
  3. muekno

    muekno Active Member HowtoForge Supporter

    no not shure just looked and did set inetprotocolls to ipv4
    Thank you
     
    muekno, Aug 6, 2025
    #3
    pyte likes this.
  4. till

    till Super Moderator Staff Member ISPConfig Developer

    Create an IPv6 reverse record. If your system has an IPv6 address, you should have a PTR record for it.
     
    till, Aug 6, 2025
    #4
  5. pyte

    pyte Well-Known Member HowtoForge Supporter

    If your infrastructure is configured for IPv6 and you want to use IPv6 then you should follow @till advice here, otherwise the solution you choose is fine.
     
    pyte, Aug 6, 2025
    #5
    muekno likes this.

Share This Page