To disable automatic grouping of duplicate messages,

To disable automatic grouping of duplicate messages, quit Mail then run this command in Terminal:

 

     defaults write com.apple.mail AlwaysShowDuplicates -bool true

 

To revert to the default setting, run this command:

 

     defaults write com.apple.mail AlwaysShowDuplicates -bool false

 

or simply delete the setting altogether with this command:

 

     defaults delete com.apple.mail AlwaysShowDuplicates

 

If you want to see how Mail behaves with this setting enabled, but without modifying your preference file, start Mail from Terminal with this command:

 

     /Applications/Mail.app/Contents/MacOS/Mail -AlwaysShowDuplicates YES

About Ian

I am a New Zealand and EC citizen, living and working in Hastings in the North Island of New Zealand. On March 5th in 2004 I retired from exactly 30 years with IBM UK Ltd, working in the Hursley software development lab near Winchester in the south of England. I am now an IBM Distinguished Engineer emeritus, working to my own agenda while retaining access to my colleagues and information inside IBM.
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