Xenforo sent 400.000 emails

[Salamanca]

Hi there,

We have been running Xenforo v2.2.3 Patch 1 for more than a year now.
Our normal email daily sends are 1000 to 2000 emails. All of them are notifications for subscriptions.

Yesterday, all of sudden, we noticed that Xenforo had sent 400.000 emails via our email smtp provider (Sendgrid) in just a few hours.
These were all duplicates of the same message. For example, a notification email "You have a new private message" was sent to some users 20.000 times (each).

Horror story...

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