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Rossano Lunardi @ NaturaSì wrote:
> Hello,
>
> we use Sympa 5.3.3 to send about 40.000 newsletter emails every month
>
> it works greatly but there is a but…
>
> we don’t send always our emails to ALL the subscribers: sometimes we 
> need to send an email to a specific sub-group
>
> for example: just to the subscribers living in a certain province
>
> is it possible to apply a filter to the subscriber list and send just 
> to a sub-group?
Yes it is, but you should consider thinks in another way :

* create each sub categories lists
* create the global list which include each sub categorie list using the 
include feature. (includes are dynamic and will not create duplicate email).

Hope this help.
Serge