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Which headers to set when sending emails with an API to avoid emails to be thread-grouped in Gmail client

Let's say I send customized/different emails for 20 persons with my email provider API.

But all emails have the exact same subject (let's say "Hello"), and this cannot be changed.

These emails are sent to 20 different persons, but also as BCC to myself (example@gmail.com) so that I keep a copy in my inbox.

How to avoid these 20 emails to be grouped in the same thread? (Note: I don't want to disable Conversation view for the Gmail client).

My email provider offers to add custom email Headers.

Which headers to set in an email so that emails with same topic, same sender, are not grouped in the same thread in the Gmail client?

Linked topic: Force emails not to be grouped into conversations.

Solution

  • I found the solution in https://workspaceupdates.googleblog.com/2019/03/threading-changes-in-gmail-conversation-view.html.

    Setting a header of the form References: <uuid@youremailproviderhere.com>, with a unique UUID for each email is enough to solve this.