https://connect.mozilla.org/t5/discussions/thunderbird-automatic-marking-of-messages-as-read-not-working/m-p/130086#M52117 <P>Hi, with v.152 Thunderbird no longer marks messages as read in some instances.<BR />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).<BR />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.<BR />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.<BR />What's the point, since I already read it in the preview?</P> Thu, 25 Jun 2026 05:53:02 GMT mb1 2026-06-25T05:53:02Z https://connect.mozilla.org/t5/discussions/thunderbird-automatic-marking-of-messages-as-read-not-working/m-p/130086#M52117 <P>Hi, with v.152 Thunderbird no longer marks messages as read in some instances.<BR />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).<BR />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.<BR />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.<BR />What's the point, since I already read it in the preview?</P> Thu, 25 Jun 2026 05:53:02 GMT https://connect.mozilla.org/t5/discussions/thunderbird-automatic-marking-of-messages-as-read-not-working/m-p/130086#M52117 mb1 2026-06-25T05:53:02Z https://connect.mozilla.org/t5/discussions/thunderbird-automatic-marking-of-messages-as-read-not-working/m-p/130529#M52264 <P><SPAN>Setting &gt; Config Editor </SPAN><SPAN><BR /></SPAN><SPAN><BR /></SPAN><SPAN>mailnews.mark_message_read.auto = true<BR /></SPAN><SPAN>mailnews.mark_message_read.delay = true<BR /></SPAN><SPAN>mailnews.mark_message_read.delay.interval = -1 </SPAN></P> Tue, 30 Jun 2026 07:41:51 GMT https://connect.mozilla.org/t5/discussions/thunderbird-automatic-marking-of-messages-as-read-not-working/m-p/130529#M52264 nicu_licchio 2026-06-30T07:41:51Z