broken sync: IMAP -> local -> IMAP

[Sebastian Spaeth]

On Tue, 22 Nov 2011 13:10:04 +0100 (CET), Timo Nentwig <foo at nentwig.biz> wrote:
> Hi!
> 
> I do sync between 2 IMAP servers. Actually, it's a one-way backup sync from 
> remote to local. I run into validility errors all the time with by INBOX.Sent 
> folder. Tried all kinds of file deletions (last attempt: find .offlineimap/ | 
> grep Sent) and resyncs and stuff and know have the behaviour that all mail is
> downloaded from remote to local and then sent 
> back to remote (and then probably sync'ed back again, i.e. duplicating all 
> mails).

Hi,

Folder validity errors occur when the UIDvalidity value changes. So
servers change the UIDvalidity whenever a folder was empty. Does your
syncing involve completely emptying the folders?

Sebastian
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