The Mutt E-Mail Client : Reference : Configuration variables : duplicate_threads
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## 6.3.39. duplicate_threads

Type: boolean
Default: yes

This variable controls whether mutt, when sorting by threads, threads messages with the same message-id together. If it is set, it will indicate that it thinks they are duplicates of each other with an equals sign in the thread diagram.

The Mutt E-Mail Client : Reference : Configuration variables : duplicate_threads
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