Mark a message as brands to read the entire thread as read.

Other marking as read e-mail clients on a single message in a thread mark only this message as read. With Thunderbird, if I have three unread messages in a thread and manually mark one as 'read', the other two messages change to 'read' as well. I saw > sort by > Unthreaded the value, but I think not all the other parameters that may affect this behavior.

"If I type 'R' when a single mail unread is highlighted.

According to this document:

https://support.Mozilla.org/en-us/KB/keyboard-shortcuts

R mark a thread as read. Where did you get the idea that R marks a message as read?

Try M to toggle the State read/not read an individual message.

Tags: Thunderbird

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