225305 - Junk mail downloaded twice if moved to 'Local Folders'?

Status: RESOLVED INCOMPLETE

(MailNews Core :: Filters, defect)

Description

[Christian Hamacher]

User-Agent:       Mozilla/5.0 (X11; U; Linux i686; rv:1.6a) Gecko/20031029
Build Identifier: Mozilla/5.0 (X11; U; Linux i686; rv:1.6a) Gecko/20031029

I am using a remote IMAP account, and have set up junk mail controls to move
detected junk mail to the 'Junk' folder on 'Local Folders' (in order to avoid
wasting space for junk on the IMAP server). Obviously, MailNews has to download
the message in order to determine junk status - however, it seems that instead
of downloading it once, and in the 'Junk' case immediately moving it to 'Local
Folders', it redownloads the Message to move it.

Reproducible: Always

Steps to Reproduce:
1. Have a remote IMAP account
2. Wait for junk mail to arrive (shouldn't be too long these days :-/)
3. Open the remote INBOX

Actual Results:  
It seems like roughly twice the amount of data is transferred if junc is moved
to a local junk folder compared to moving the junk to a folder on the IMAP
server. I *assume*, that this point to junk mail being transferred over the link
twice.

Expected Results:  
The location of the junk folder should not make a difference, since the mail has
already been downloaded in order to analyze it.

I'm aware that this bug report is not specific enough, since I have so far not
*proved* that mail is downloaded twice. I'm only looking at the time it takes to
download mail from an account that receives a high load of mailworms at the
moment, and thus needs to transfer a lot of large spam mails.

I'm filing this anyway in the hope that someone can either point me towards a
way of asserting that mail is really downloaded twice, or that someone with code
knowledge will speak up.

Comment 1

[Christian Hamacher]

I'm quite sure now that junk mail controls really download messages twice, once
to analyze it and once to move it to the local Junk folder.

I was away for a week, and consequently hat a huge amount of junk acumulated in
my inbox. It took about ten minutes to first classify the junk - after this
time, all junk messages had a junk icon, and therefore, all junk messages had
been downloaded once, in order to analyze them.

After that, it took another ten minutes to move them to the local folder. During
the whole 20 minutes, my link was completely saturated.

Comment 2

[Christian Hamacher]

Still present with current nightly

Comment 3

[(not reading, please use [e-mail] instead)]

sorry for the spam.  making bugzilla reflect reality as I'm not working on these bugs.  filter on FOOBARCHEESE to remove these in bulk.

Comment 4

[Serge Gautherie (:sgautherie)]

Filter on "Nobody_NScomTLD_20080620"

Comment 5

[Wayne Mery (:wsmwk)]

  Christian ever seen this again?

Comment 6

[Christian Hamacher]

Oh my, this is ancient ...

Sorry, can't tell: first, I moved away from Thunderbird (now using kmail from within kontact); and second, I now have a fast DSL connection, so even if the problem was still there, I would not notice it anymore.

This has been around for so long and nobody else piped up in the meantime; I'd close it and wait for a more thoroughly researched report in case the problem was still there.

Comment 7

[Wayne Mery (:wsmwk)]

thanks Christian.
=> incomplete then