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This blog post was published under the 2015-2024 Conservative Administration

We’ve removed 98% of gsi-family domains from the public sector

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We posted previously about our work removing gsi-family domains from the public sector and why we are doing it.

This work is now complete and over 3,500 domains have been removed including:

  • all domains
  • all domains
  • all domains
  • 2533 domains - 83 remain (further details below)

We will continue to monitor the remaining domains for issues, but this work has removed the bulk of the risk of email spoofing and domain hijacking from misconfiguration for these domains. We expect that further work may be required in the future to completely remove and to look at the domains that remain within the PSN (Public Services Network).

Changes made

Since our previous blog, we’ve made the following changes:

  1. At the end of January 2023 we updated the Domain-based Message Authentication, Reporting and Conformance (DMARC) records to block email from any domain without its own DMARC record. 
  2. At the beginning of March 2023 we suspended domains in the internet-facing zones for 72 hours to help identify any remaining services. 
  3. At the beginning of April 2023 we permanently removed the internet-facing zones for, and and the domains they contained. Most domains were also removed but a small number remain.

Please note that no PSN-facing zones were changed during this work.

What to do if you still have gsi-family domains

There are 83 domains remaining. If you still have one of these domains you should take steps now to remove it. If it still works for email, we recommend you change settings to start rejecting inbound email. You can also choose to include a bounce-back message giving senders the correct address.

You should also check public facing websites or documentation for mentions of gsi-family domains and remove them.

If you have any questions around this work or need advice on removing a domain get in touch with us at

If you have a domain that has been suspended or removed as part of this work and you need it restored contact Nominet directly on or 01865 332493.

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