FAD-2643 Added sending domains filter and deliverability end-point
FAD-2643 Added sending domains filter and deliverability end-point

SparkPost/sparkpost-api-documentation,tjtate/sparkpost-api-documentation,SparkPost/sparkpost-api-documentation,SparkPost/sparkpost-api-documentation,tjtate/sparkpost-api-documentation,tjtate/sparkpost-api-documentation