My website sends emails to me with the same subject and they are being grouped into conversations even if I delete old ones (Mail, Gmail). I know I can change the subject to prevent this, but is there a header or something else that can be added to do this without forcing unique subject lines?
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On the top of my head, there are two methods to avoid threading:
X-Entity-Ref-ID
with any value. This is what Google+ notifications do.From: info+randomstring@example.com
). This is what Facebook notifications do.The threading will be made if you force it with
Reference
orReply-To
.