User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.5) Gecko/20031007 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.5) Gecko/20031007 When two independent messages (having no references to each other, for example, made by pressing 'Compose' in Mozilla) with equal headers are viewed in mode 'Display message threads', they are shown as one thread. Reproducible: Always Steps to Reproduce: 1. Send two independent messages to one account so they go into one folder. 2. Click on the icon which has 'Click to display message threads' popup. Actual Results: Both messages are shown as they are in the same thread. Expected Results: Messages should make two different threads I will post two expamle messages and a screenshot of what I see.
Created attachment 133827 [details] Screenshot of message pane. A thread of two messages in previous attachments is seen. They should make two threads.
All you need are two messages with the same subject. IMO it's a feature. The simplest example is Bugzilla Bugmail. Each of the emails for this bug (ignoring the original and any requests) have the same subject (until you change it), so they'll be grouped as a thread. The bugmails don't have internal threading headers, so this is the only way for any email app to make them into a thread.
Dupe 164115 *** This bug has been marked as a duplicate of 164115 ***