24-06-2026 10:53 PM
Hi, with v.152 Thunderbird no longer marks messages as read in some instances.
I have the message list on the left (sender's details, subject, timestamp) and the preview of the entire message on the right (with the entire message body).
Before, it was sufficient to select the message from the list to have it automatically marked as read after the predetermined time (I chose "after 2 seconds"), but now this is no longer possible: the message stays unread even though I have already read it to the full in the preview window.
This is very annoying, as I have to literally open each message (or choose the "mark it as read" option) manually to have it marked as read.
What's the point, since I already read it in the preview?
30-06-2026 12:41 AM
Setting > Config Editor
mailnews.mark_message_read.auto = true
mailnews.mark_message_read.delay = true
mailnews.mark_message_read.delay.interval = -1