Hi @puziom and welcome to the Community!
If you are simply trying to disable the notification that is generated when the issue moves from Resolved (or Canceled) to Closed, the solution given to me by Support was to disable "Customer-visible status changed" in the project's Customer notifications settings.
This will turn off any status change notifications that do not include a public comment, such as Reply to customer.
If this answers your question please consider marking the answer as Accepted, as this will help others find the solution in the future!
Are changes being made on the issue still after closure?
Cause then it is linked to the issue updated part. (and might be a best practice to restrict that).
Then if they are watchers or the assignee they will still get them when the "Issue Updated" is triggered.
Issue Closed will only handle the transition towards the Closed status.
Do you see what email they get exactly? Is is a notification template you can relate back to a specific action?
It can also be that you have a "Send Email" postfunction on the Transition to Closed (which is then not handled by the notification scheme) depending on whether you have some apps able to send emails.
All that that rules does it move the issue to the "closed" status. This doens't send email on its own.
The transition to the status however that could be an event that sends an email.
If the notification scheme doesn't send anything you can always see whether there is an email postfunction set up on the state transition on the flow itself.
(or see if there is another automation set up to send out an email when the issue goes to closed)
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