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I have a piece of software that is sending multiple e-mails.
The first one has the header
Message-ID: <153495492389.29001.486258560116169081@server.example.com>
The second and all following ones have the headers
In-Reply-To: <153495492389.29001.486258560116169081@server.example.com>
References: <153495492389.29001.486258560116169081@server.example.com>
But it seems that this is not enough for Outlook to display those messages as conversation, even if showing conversations is enabled.
Can someone enlighten me what is necessary so that the mails can properly shown as conversation in Outlook?
Never seen anything official but my observation is that the subject line must match (prepended
FW:
andRE:
don't count). – I say Reinstate Monica – 2018-08-22T19:06:02.637That is my observation also. From, To, Cc, etc., addresses don't count either. – Jamie Hanrahan – 2018-08-22T21:35:32.753
Thanks, but that is not true, thank god. I frist thought you are right as with the same subject it worked. But that is only used as fallback. Bugzilla to the rescue: https://bugzilla.mozilla.org/show_bug.cgi?id=411601. You need to have the same UUID in the
– Vampire – 2018-08-22T22:57:27.910Thread-Index
header, then they are grouped no matter whether the subject is the same or not, but the has to follow the format nevertheless. Any arbitrary value will not work, as I tested this before I wrote here already.