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(if you wish to achieve this without any code)This can be done by creating a custom button which executes onclick javascript, however, you will have to select the list of people who belong to a specific profile and add them to the to list:location.replace('/email/author/emailauthor.jsp?retURL=/{!Campaign.Id}&p3_lkid={!<Campaign>.Id}&rtype=003&template_id=<give the template ID>&p24={!<Campaign>.email_to__c}'); //here email_to__c is the custom email field where TO: email address is stored