Finally I have found out what is causing the problem, it is a known issue with
manage sieve:
http://dovecot.org/pipermail/dovecot/2012-September/085585.html
Unfortunately the Ubuntu repository has the buggy version, I just filed a bug
report to upgrade it.
Hopefully they will do that, otherwise I
> Er, below you've wrote that "It uses port 2000 to communicate with dovecot
> via the ManageSieve plugin." Now you write "webmail can't modify them" ... .
> So it seems that the webmail is not using port 2000??
Sorry, I meant that it can't modify the rules via ManageSieve. I'm pretty sure,
tha
