[Bug 283682] KMail duplicates filtered messages

[Simon Reed]

https://bugs.kde.org/show_bug.cgi?id=283682

Simon Reed <BugZilla at S-and-J.co.uk> changed:

           What    |Removed                     |Added
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                 CC|                            |BugZilla at S-and-J.co.uk

--- Comment #20 from Simon Reed <BugZilla at S-and-J.co.uk> ---
I believe the problem I have in 4.8.4 is the same problem: emails passing
through filters are sometimes being duplicated.

I have a cron job on my servers which send me an "hourly test email" message
which I receive on my desktop PC; these have been running for about two years
without trouble.  I have upgraded my desktop from Ubuntu 10.04 and kmail to
Xubuntu 64-bit 11.10 and kmail v4.7.3 on my desktop and I am now seeing some of
these hourly emails as identical duplicates (same ids in the headers, etc.) in
their folders in kmail2.

For example, my PC was unattended for 11 hours last night and during that time
3 of the hourly emails appear as duplicates in their folder.  

The emails are fetched by kmail2 using POP3 and filed into mbox folders by
filters.  When using kmail I had it set up to remove emails from servers; I set
kmail2 to leave it on the servers (just in case I reverted back).  On the
server I can see there are no duplicates so they were not sent as duplicates.

The rule checks the subject of the email contains "Hourly Test Email" and the
"Envelope-to" equals the email address I specified for this sending server.  it
then moves the email to the correct folder and processing rules is then
stopped.

These email checking filters are applied before "Bogofilter check", "Spam
Handling" "Classify as Spam" and "Classify as NOT spam" filters, so they are
all probably innocent.

The email was downloaded and processed by "interval email checking".

To reproduce it:
1. Set up a filter to receiving incoming email and automatically file it in a
folder.
2. Send lots of emails to it.
3. Check the folder.

I just did this by manually sending 18 emails; one of them in the middle was
duplicated.

I set up a script to send an email every 5 seconds and sent 77 emails.  79
arrived; two had been duplicated.

The package I have installed is: kmail 4:4.7.4+git111222-0ubuntu0.1
"About KMail" says "KMail Version 4.7.3, Using KDE Development Platform 4.7.4
(4.7.4)"

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