From kmail-devel  Sun Jun 10 20:56:43 2001
From: Don Sanders <sanders () kde ! org>
Date: Sun, 10 Jun 2001 20:56:43 +0000
To: kmail-devel
Subject: Re: Bug#26848: kmail repeat messages download
X-MARC-Message: https://marc.info/?l=kmail-devel&m=99220697415300

Alternative explanation:

The pop server has a buggy UIDL and/or LIST implementation. 
So like other users have reported extra blank (Unknown) 
messages sometimes appear. The UIDL command (sometimes) 
returns errorneous information (eg nothing) and this causes 
KMail to write an empty (or bogus) list when it saves the 
list of UIDs of seen messages. The next time mail is 
retrieved because the list of UIDs of seen messages is 
empty (or bogus) all messages are retrieved.

I guess other mails clients don't rely on the UIDL command 
for normal mail retrieval while KMail does. Which is why 
other mail clients don't suffer when pop3 servers have a 
buggy UIDL implementation (in the case of normal mail 
retrieval).

The benefit of using UIDL for normal mail retrieval (ie not 
leaving the mail on the server) is that if the transmission 
is interrupted partway through downloading a list of 
messages then KMail knows which messages have been 
successfully downloaded and can avoid downloading those 
messages again next time a connection to the server is 
established.

The downside is that buggy pop3 servers cause problems.

On Sunday 10 June 2001 20:34, Michael Häckel wrote:

> On Friday, 8. June 2001 23:16, Julian Rockey wrote:
> > You know, I think this bug may be separate from the
> > low-interval related bug. I've had this problem on
> > occasion even though I have my interval set to 5
> > minutes and a fast cable connection (the chances of a
> > check-in mail taking over 5 minutes very very slim). It
> > seems to hit certain folders and not others (I filter
> > the mail from different accounts into different
> > folders). The folders where this was happening also
> > starting to get the mysterious empty messages from
> > "Unknown".
>
> If it only appears in certain folder, then I doubt, that
> it is related to POP3.

Probably a particular pop3 server is being problematic 
since the user stated that mail from different accounts is 
stored in different folders.

Would be nice to know the identifying string of the buggy 
pop3 server.

Don.


> If you have "Unknown" messages in a folder, then most
> likely the mailbox file came out of sync with its index
> for some reason. That should actually not happen, but it
> can happen if you access your folders with a different
> mailclient and this client doesn't change the file
> modification time, like mutt does sometimes.
> Removing the corresponding ~/Mail/.<foldername>.index
> file should help.
>
> Regards,
> Michael Häckel
>
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