You should see that message only for a short time. It should disappear after the restore has finished as long as outgoing emails weren’t disabled when you created the backup. Refreshing the page in your browser should help if the notice doesn’t disappear automatically.
I’m leaving this as Contribute > Bug, because the way we currently disable outgoing emails before the restore is quite useless. Sidekiq is disabled during the restore, so nothing can happen during that time. And the restore overwrites the value of the disable_email setting. Fixing the bug would require changing the site setting after the restore.
@eviltrout You added this in When restoring a backup, disable emails. · discourse/discourse@ccf9b70 · GitHub. What’s your take on this? Should we fix the bug or remove the code? In my opinion changing a site setting after the restore would be quite unexpected, so I vote for removing. Moreover nobody complained about this problem in nearly 3 years… 