267266 - Long "Downloading message" process (getting all bodies) on big IMAP folder

Status: RESOLVED WORKSFORME

(Thunderbird :: General, defect)

Description

[Mikhail Ramendik]

User-Agent:       Mozilla/5.0 (compatible; Konqueror/3.2; Linux) (KHTML, like Gecko)
Build Identifier: version 0.8 (20040913)

I use Thunderbird 0.8 on Linux (RH9-derivative). I am using an IMAP server for 
local storage (DbMail).  
  
When Thunderbird opens a big IMAP folder that it did not open before, it 
downloads the headers for all the messages in it - as it should do; it counts 
them when downloading.  
  
Then, it says "Downloading Message" in the status line, and starts a long 
downloading process. According to the IMAP server's log, it downloads the 
bodies of all the messages in the IMAP folder.  
  
Apparently it does not save these bodies anywhere; when I later open a message 
in the folder, Thunderbird downloads its body again.  
 
(This folder is not "selected for offline use" - I did check this). 

Reproducible: Always
Steps to Reproduce:
1. Use an IMAP server that logs every IMAP command. I use DbMail 2.0 
(http://www.dbmail.org). 
2. Create an IMAP private folder with 10,000 or more messages, without using 
Thunderbird. (I used DbMail's mbox import script; using another email client 
will probably be as good). 
3. Register this IMAP account in Thunderbird. 
4. Click on that folder in the mail tree. (it should not be "selected for 
offline use".) 
5. Wait for the "Downloading headers" count to complete, and see what comes 
next	 
 
Actual Results:  
Displayed "Downloading message" and spent a long time communicating with the 
IMAP server. According to the IMAP server log, it requested the body of every 
message: 
 
COMMAND: [6615 UID fetch 108434 (UID RFC822.SIZE BODY.PEEK[])] 
 
and this for every mesage in the folder. 

Expected Results:  
It should have downloaded just one message body for the current preview pane.

Comment 1

[David :Bienvenu]

it's analyzing the unread messages that it has not seen before for junk status -
you'd need to turn off the junk mail controls for it not to do that. There are
requests to be able to specify folders *not* to check for spam when you open them...