post https://my.surveypal.com/api/rest/emailtask//activate
Activates the email task.
Activates the email task if it is an draft and it contains email templates. Empty email task cannot be activated because there is no reason to run it.
curl -i -X POST \
-H "Authorization: Basic YOUR-USERNAME-AND-TOKEN-BASE64-ENCODED" \
-H "Accept:application/json" \
'https://my.surveypal.com/api/rest/emailtask/:id/activate'