'Sending emails to Queue members in salesforce on task object

Currently, I want Queue members to get mail based on the task type which is created. Task_type__c is the Picklist field on the Task object. I have 8 values in that Picklist field. i.e 8 Task type. According to each task type, one Queue should be assigned to them. So I have created 8 Queues. If the Task type is 1 then Queue 1 should be assigned and Queue members of that Queue 1 should get an email. I have tried all the possible ways but couldn't find out why email is not going to queue members. I want this feature. Can anyone please help?



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