509932 - spam emails not automatically moved to Junk folder

Status: RESOLVED DUPLICATE of bug 362247

(Thunderbird :: General, defect)

Description

[Arne Schirmacher]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.9.1.2) Gecko/20090729 Firefox/3.5.2
Build Identifier: Version 2.0.0.22 (20090605)

My IMAP email server has folders having known spam emails, but they are not always automatically moved to the spam folder after the folder has been selected. 


Reproducible: Sometimes

Steps to Reproduce:
1. select an IMAP folder having a spam email
2. 
3.

Actual Results:  
spam email is not moved to spam folder

Expected Results:  
When selecting a folder (either by clicking on it or scrolling by
arrow-up or arrow-down), I expect that right after being selected all spam
emails would be scanned, marked and automatically moved to the spam folder. 

The IMAP server has a very large folder hierarchy (> 1000), for example 2009/customername1, 2009/customername2 etc. Some of these folders have spam emails. The folders are new and have never seen by TB before.

If I manually choose the "Apply junk filter to folder" command, the spam emails are in fact marked and moved. It makes no difference whether the emails are marked as unread or read. Also, if I manually mark an email as junk, it is also moved. 

However I have observed the correct behaviour once, after many days of seeing the incorrect behaviour: Selecting a folder marked all spam emails as spam and moved them away. It did not work that way the next day. The TB and the IMAP server configuration was not touched other than subscribing/unsubscribing to different email folders. 

I have also noticed that TB was in fact downloading all emails from the IMAP
server when it was properly working. So it took a couple of seconds to
download/process/mark/move the emails. There is no such delay when accessing
any folder right now. Maybe the root cause for the bug has to do with TB not
downloading the email body right now.

Another account in the same TB configuration shows the expected behaviour: new spam emails getting in the inbox are marked and moved.

Thunderbird settings (translated back to english from my german Thunderbird release): 

The account settings: checked "activate junk filter" and "move new junk email to folder "Junk" in "account". The other two settings are unchecked. The Junk folder exists on the IMAP server. I have also tried creating a different folder and choosing that one as the Junk destination. 

The global settings: checked "when messages are manually marked as junk, move
them to the assigned Junk folder".

No Anti-Virus or other software interfering with TB is installed on the PC. I reproduced this by installing TB on a different PC.