226671 - [RFE] subject should not be used for determining threads

Status: VERIFIED DUPLICATE of bug 164115

(SeaMonkey :: MailNews: Message Display, enhancement)

Description

[Kostub]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.5) Gecko/20030916
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.5) Gecko/20030916

Subject of the message should not be used for determining threads. This is
because many mails from different people could have the same subject. This is
very true of generic subjects like "Hi", "(no subject)", "Re: (ur mail)" etc. 

Instead mozilla should use the following:
Message-ID, References, In-Reply-To

Unfortunately microsoft Outlook does not support these headers (as they always
have to use something other than the standard ;-) )
They use the following headers:
Thread-topic: Thread-index:

Threading by subject could be implemented, but it *should* be optional. The user
may set a config value depending whether they want it enabled or not.

c.f. http://cr.yp.to/immhf/thread.html

Reproducible: Always

Steps to Reproduce:
1.
2.
3.

Comment 1

[Jo Hermans]

See discussion in bug 197173.

*** This bug has been marked as a duplicate of 164115 ***

Comment 2

[Henrik Skupin [:whimboo][⌚️UTC+2]]

verified.