NTP users are strongly urged to take immediate action to ensure that their NTP daemons are not susceptible to being used in distributed denial-of-service (DDoS) attacks. Please also take this opportunity to defeat denial-of-service attacks by implementing Ingress and Egress filtering through BCP38.

ntp-4.2.8p15 was released on 23 June 2020. It addresses 1 medium-severity security issue in ntpd, and provides 13 non-security bugfixes over 4.2.8p13.

Please see the NTP Security Notice for vulnerability and mitigation details.

---

Are you using Autokey in production? If so, please contact Harlan - he's got some questions for you.

• rbl-plus.mail-abuse.org
• blackholes.mail-abuse.org
• zen.spamhaus.org
• cbl.abuseat.org
• list.dsbl.org
• dynablock.njabl.org
• dnsbl.njabl.org
• relays.mail-abuse.org
• nonconfirm.mail-abuse.org

We also maintain internal static black lists of servers or networks that have abused our systems in the past.

If you would like to learn more about what black lists are and how they work, the WikiPedia article on blacklists is an excellent place to start. You can also look up your IP address or your mail server via any of various different services, including https://www.mxtoolbox.com/blacklists.aspx, and https://www.dnsbl.info/advanced.asp, among many others.

See also the main AntiSpam page which describes various standard anti-spam techniques that are used to protect the ntp.org mail system, of which the black lists mentioned here are just one mechanism.

Please contact our Postmaster Services Team if you have any further questions regarding the black lists that are used within the ntp.org mail system.

Settings:

Set ALLOWTOPICCHANGE = NtpPublicServicesProjectStaffGroup