Email threading broken

[traut]

I think it’s not the problem of thunderbird, but of any mail client which supports threading. But I don’t know whether the difference between different informations within in-reply-to and references here may depend on different interpretations.

What I actually see is that you fixed References by now, according to rfc5322:
In-Reply-To: quotes the message-id of the message you reply to.
References: appends the message id of the replied message to the former references

First post

Message-ID: <msg-id1>
…and no References

1st reply

`
Message-ID: <msg-id2>
In-Reply-To: <msg-id1>
References: <msg-id1>
`

2nd reply:
…

Message-ID: <msg-id3>
In-Reply-To: <msg-id2>
References: <msg-id1>  <msg-id2>

…

However, you broke the message IDs as indicated within

Mailing list mode: threading is broken

Hi all, as member of the openstreetmap I found several problems with disourse, which is used for their online forum now. I was told that the mailing list interface should work very well. However, I found a but that threading becomes broken when you reply by e-mail. Then a new message ID is generated instead of re-using the original ones Example The main concept is ok - it used e.g. format: thread msg-id in-reply-id 1 topic/851. the initial thread 1.1 topic/851/2747. topic/851 Message 274…

BTW: Is there another bug that marking multiple lines as preformatted text does include the cmd-e marking not once, but many times, for each line one?