Force emails not to be grouped into conversations

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On the top of my head, there are two methods to avoid threading:

  • set the SMTP header X-Entity-Ref-ID with any value. This is what Google+ notifications do.
  • change the sender email (you can use From: info+randomstring@example.com). This is what Facebook notifications do.

The threading will be made if you force it with Reference or Reply-To.

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