[Dovecot] hwo can i have managesieve protocol and cmusieve plugin work at the same time

[Stephan Bosch]

Jelle de Jong wrote:
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> Hello everybody,
> 
> I would like to use managesieve protocol and cmusieve plugin at the same
> time.
> 
> I have used the cmusieve plugin for years and I now also enabled the
> managesieve system. I got the managesieve system working but when I
> activate the managesieve filter for the user the cmusieve sieve filter is
> not used anymore.
Yes, that is difficult for Dovecot v1.1 and there is no real good 
workaround. The Sieve implementation for Dovecot v1.2 does have support 
for executing multiple Sieve scripts sequentially, making it possible to 
truly force execution of the administrator's script before the user's 
script.

> How can I have both sieve systems working, the cmusieve is for a global
> all user spam filter, and the managesieve is for one user only. I don't
> want the user to have control over the spam sieve filter, because other
> systems depend on the location where spam is archived.
> 
As a workaround, one may think it is possible to have your global 
x-spam-flag.sieve include the user's sieve script with the include 
extension. This will work, however, the CMUSieve plugin requires any 
included Sieve script to exist. A nasty side effect of this is that any 
user who deactivates his Sieve script through ManageSieve ends up 
deleting the link to it on the server. This will break the include from 
the global Sieve script and end its execution.

I am not sure whether there is a proper workaround to achieve something 
like this for Dovecot versions prior to v1.2. Can't think of any...

Regards,

Stephan