December 10th, Google Workspace Administrator 2FA Guidance Email Mistakenly Sent to Wrong Recipients

Hello everyone. This is the Netkiller Support Team.

At Netkiller Inc., we have always strived to protect and manage customers’ information. However, due to a human error, we regret to inform you that on Sunday, December 10, 2023, an email containing instructions for Google Workspace administrators’ two-step authentication intended for a specific client was mistakenly sent to some other clients. Netkiller sincerely apologizes to all our clients and promises to take the following measures and make efforts to prevent such incidents in the future.

Incident Summary:

On December 10, 2023, around 2:10 PM KST, a Netkiller customer support representative accidentally CC’ed an email to other customers while providing instructions for a GWS administrator’s 2-step authentication. As a result, one customer’s email contents were partially exposed to Netkiller clients.

Exposed Information:

  • Basic contact information specified in the email footer of the client
  • Instructions for setting up GWS administrator’s two-step authentication (excluding specific client-related details; the instructions contained general technical guidance)

Measures and Improvements:

Netkiller has taken measures to implement a mandatory internal approval process for mass-sent emails to prevent such incidents from happening again in the future.

We sincerely apologize once again for causing concern to our valued customers. 

Inquiries and Support:

If you have any questions regarding Netkiller’s security compliance policy, please don’t hesitate to contact us at

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