Users are receiving multiple notifications when they add files\mails to a activity with the IBM Connections plugins for Notes.
Customer can reproduce this problem in the production environment
It has nothing to do with the customization's, because to reproduce this problem customer does not use the browser, they are using the plugins for notes in the Notes client.
Development informed that using the Notes Plugin to upload an email with attachments to an Activity works in the following way.
Each piece is uploaded in sequence, the email + any attachments.
Activities doesn't realize all the pieces coming in are from one email upload action.
Therefore, each time a piece comes in, a new event is triggered which will send an "Activity has been updated" email to anyone following with notifications turned on.
Any change to this behavior would be an enhancement request as there isn't a defect here.