[MlMt] Thread-Id

[leo]

Hi all

MailMate offers me the field „Thread-Id`“ for mailing list thread related filtering. This works well.

However I would like to convert some of my mailing list logic from the client (MailMate) to the mail server (via a sieve script). But in the raw message of, let’s say, the MailMate mailing list I cannot find a header `thread-id` or similar.

What mail header does the Thread-Id field use?

Many thanks,
Leo
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