[horde] Problem with Horde "Mailbox does not support mod-sequences"

[Luca Bertoncello]

Zitat von Hendrik Noack <hn at axxedia-it.de>:

> I do use Debian 8 with Dovecot and Horde 5.2.17. I never experienced this
> error before, but I don't think it is related to Horde. Is it a general
> problem or does it only happen to some users?
>
> You could rule out horde by using an IMAP client like thunderbird against
> your dovecot server.  Horde is just using IMAP (via php). Are you using the
> default imp IMAP configuration or did you customized it? If so, could you
> please try it with the default (if thats possible in your setup)?
>
> If you can rule out horde it must be some kind of problem with the dovecot
> configuration or with specific mailboxes. If you use maildir format, you
> could try to make a backup of the mailbox directory and start fresh to see
> if that helps. You can even copy a few mail files back in there, dovecot
> should rebuild the index by itself the next time you access the directory
> from an IMAP client. Try to delete them.

Another information:

I just have this problem if I do something in the INBOX folder!
On other folder (sent, spam, and so on) the problem does not happen...

Very very strange...

Thanks
Luca Bertoncello
(lucabert at lucabert.de)