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Stop Tbird from marking email as read on server

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When Tbird gets mail from server (IMAP) it marks it as read on server, or when it is read in Tbird. When I then synchronize my K9 Mail in android it shows up as read. How do I stop this from happening?

When Tbird gets mail from server (IMAP) it marks it as read on server, or when it is read in Tbird. When I then synchronize my K9 Mail in android it shows up as read. How do I stop this from happening?

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IMAP email is server based. You read and manage your messages remotely from your devices. If you read a message on any device it is marked and displayed as read on the server. If you delete a message from any device or at the server it is gone.

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There must be some setting somewhere that will not mark it as read on the server?

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You read the message on the server via Thunderbird. It marked as so.

Right click the message and select Mark as Unread.