User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.5) Gecko/20030916 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.5) Gecko/20030916 Clicking on the "sort by trash/non-trash" (there are no other obvious meanings for this operation) column button, I expect that messages marked as trash will appear first (or last) and non-trash messages will follow (or preceed). I'm not seeing this behaviour though. Some non-trash messages are being sorted into the trash marked messages. This has been around for a while (several releases). Reproducible: Sometimes Steps to Reproduce: 1. Take a folder with a lot of trash marked messages 2. Add in a few non-trash marked messages 3. Click the "sort by trash/non-trash" button 4. Observe the resulting order. Actual Results: Some non-trash messages are being sorted into the trash marked messages. Expected Results: Messages marked as trash will appear first (or last) and non-trash messages will follow (or preceed). I read my mail via IMAP. I have a filter that moves messages marked as spam, by a mail server hosted spam filter, from my Inbox to a Spam folder. There are nearly 5000 messages in the Spam folder (kept on hand for the spam filter's database), and all are marked as trash.

I assume you mean "Sort by Junk Status". This sounds like a duplicate of bug 181143; if you have sorted by Junk originally, then mark some additional items as Junk (or Not Junk), then resort, the resorting simply reverses the order of messages without resorting.

Yes, looks like a dupe. *** This bug has been marked as a duplicate of 181143 ***