How does the email header field 'thread-index' work?

Posted by Tim on Stack Overflow See other posts from Stack Overflow or by Tim
Published on 2010-02-17T04:28:09Z Indexed on 2010/03/21 17:01 UTC
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I was wondering if anyone knew how the thread-index field in email headers work?

Here's a simple chain of emails thread indexes that I messaged myself with.

Email 1 Thread-Index: AcqvbpKt7QRrdlwaRBKmERImIT9IDg==
Email 2 Thread-Index: AcqvbpjOf+21hsPgR4qZeVu9O988Eg==
Email 3 Thread-Index: Acqvbp3C811djHLbQ9eTGDmyBL925w==
Email 4 Thread-Index: AcqvbqMuifoc5OztR7ei1BLNqFSVvw==
Email 5 Thread-Index: AcqvbqfdWWuz4UwLS7arQJX7/XeUvg==

I can't seem to say with certainty how I can link these emails together. Normally, I would use the in-reply-to field or references field, but I recently found that Blackberrys do NOT include these fields. The only include Thread-Index field.

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