new junk emails show up in junk as well as trash

This seems to be occurring more often now. Attached is a screenshot from my junk mailbox which shows 6 occurrences within past few days. As described above, it seems that I get the same message in the junk and in the trash mailboxes. I junk those in the trash, so they show double in the junk. As you can see 2 difference sources are involved, each using a different provider, so it seems that MM might be at fault.

Oh, I can't upload a new screenshot. Upload Quota Reached. Two of the above screenshots could be deleted.

Hmm, upload quota must be per user not ticket -- I noticed that I can delete screenshots myself, but that did not remedy the quota problem.

Sorry, it did remedy but it took it a while to show. Attaching the new screenshot.

It looks like a race condition because half of the emails do not have a SpamSieve score. That is, MailMate and some other email client (possibly MailMate on a different computer) are identifying these emails as spam at the same time. They are then both moving them to Junk which some times results in two copies.

In other words, I don't think it's really a MailMate bug.

It's definitely critical (and one can check with SpamSieve itself about this) that, when dealing with IMAP accounts, one have only a single client running SpamSieve, because otherwise exactly this sort of thing will happen. If you want SpamSieve to handle your spam (and who doesn't?), you should set up a drone client to do the spam checking and turn it off everywhere else. See the SpamSieve user's guide for details.

Well, it is definitely not a race condition you describe. I use only a single mail client on a single computer. No other clients and no other devices. No webmail either (well, except for emergencies, that is very seldom). Could it be a race condition between MM and SpamSieve on my computer?

Ok, we'll look for other explanations. (In your last screenshot, a few of the examples are probably not relevant because they do not have identical dates. I would assume these are simply sent to you twice at different times.)

Still an important observation: It's strange that some of the emails do not have a SpamSieve score if you have not manually moved some of them.

I suggest you keep the Activity Viewer open and then when you have observed a new duplicate then use “Help > Send Server Logs”. Hopefully I can then see what's going on. It is best if this is done shortly after it happens.

Yes, it seems that I indeed marked a few cases wrongly, paying attention only to the senders and subjects in the neighboring messages.

Those without the spam score are probably those that came into the trash (why would MM put new incoming messages into trash?) and I moved them to spam by clicking the spam button.

Seeing them in server logs shortly after they arrive would be require tremendous luck. I get hundreds of messages a day from over a dozen sources and I do not keep checking them all the time. Furthermore, I had not a single occurrence past few weeks. But then, in the past they did not occur too regularly either. There were longer stretches of time when there were no issues and then there were stretches of time that they occurred albeit irregularly, meaning like once or twice every few days.

I just found 2 such duplicated messages that came last night (one at 1:30 and another at 6:30, so I saw them first many hours later). Aside from one of them lacking SpamSieve score, they are identical -- I switched the raw message mode for each, so all message handling headers are included, copied full content, and compared them in bbedit. I can also confirm that the ones without SpamSieve scores were delivered to the trash mailbox and those with the SpamSieve scores to the spam mailbox.

Another tidbit.

I just thought I caught such a message as it came, but I was too late and it rolled out of the log. When checking UIDs, since log refers to these only, I found that the message in Trash had UID 19584 and the message in Junk had UID 1944. When I told MM to junk the message from Trash, once the message was in Junk its UID changed to 1946 (1945 is another spam message that came in the meantime).

The message in Trash had no Spam score from MM and no Spam score from SpamSieve. It acquired the former when moved into the Spam.