I use Mozilla Firefox's Thunderbird as an email client for my Virgin Mail (Blueyonder) account. For some time now Thunderbird keeps marking my emails as Unread even after I've read them.
I use the Thunderbird setting "Automatically mark as read" but, although it does do that correctly when I click on a message in my Inbox, as soon as I archive the message it goes back to showing it in bold as 'Unread' in the Thunderbird Archive folder. This never used to happen.
I know this is essentially a Thunderbird - not a Virgin - problem, but I got no response on the Mozilla forum so hope someone here can make sense of it.
Do you have any message filters defined for the account? To check this:
Does the issue still occur?
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Just to add to my original post, I've now noticed that Virgin Webmail is also marking these read emails as Unread, so maybe it IS a Virgin problem (although the Archive is a Thunderbird-created folder).
I am using Thunderbird versions 102.6.0 (64-bit) and 109.0b3 (64-bit), and cannot reproduce the issue, i.e. select received email in Inbox until it is automatically marked read, archive and confirm it is still marked as read.
Are the email accounts affected using IMAP or POP3 in Thunderbird?
Does the issue occur when using a new Thunderbird profile? FYI: Either following the instruction here to manage Profiles Using Multiple Profiles | Thunderbird Help or create a new user account for your operating systems.
I'm on Windows 10 Home (21H2) and the latest Thunderbird version, ie 102.6.1 (32-bit). The server setting is IMAP. I've only ever had one Thunderbird profile, and have been using that without problems for years.