This is already possible.

This is a support question, not an enhancement request.

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Hi,

I wonder if It is possible to associate contacts with groups and make 
Horde recongnize this groups when sending messages.

All contacts created in Turba goes to the Default group, but that 
behavior can be modified by the users that can create groups and 
associate people inside it. So it is possible to send messages to that 
group and the people inside the group will receive it instead of 
select one by one or everybody.

Thanks