Bug 4041

Summary: false subject composition
Product: Claws Mail (GTK 2) Reporter: Paul <01234+clawsmail>
Component: UI/Message ListAssignee: users
Status: RESOLVED INVALID    
Severity: normal    
Priority: P3    
Version: 3.14.1   
Hardware: PC   
OS: Linux   

Description Paul 2018-06-21 03:08:19 UTC 
If an incoming email has the same (f.e. empty) subject, the emails are incorrect listed. For example, first I write person B and months later person C with the same subject "(no subject)" (but there are completely different emails), then I get an incorrect incoming message tree because both conversations are mixed to 1 conversation and the in the emails included Message-ID respectively References(-ID) get ignored.
Comment 1 Paul 2018-06-21 10:11:29 UTC 
Presumably, if I understand you correctly, you need to go to the /Configuration/Preferences/Display/Summaries page, and uncheck 'Thread using subject in addition to standard headers'