The Mutt E-Mail Client : Reference : Configuration variables : mark_old
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## 6.3.102. mark_old

Type: boolean
Default: yes

Controls whether or not mutt marks new unread messages as old if you exit a mailbox without reading them. With this option set, the next time you start mutt, the messages will show up with an "O" next to them in the index menu, indicating that they are old.

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