Extend API with Domain management and DNS validation

Problem Currently the API cannot be used for anything besides sending e-mail. This makes managing and validating many customer domains a chore. Feature request Allow clients a high level of automation for adding domains, the requesting of DNS records and the validation of the DNS records. Solution Suggestions Extend the current Send API or add another one. Functions: Domain related Add domain Delete domain DNS related Retrieve DNS records for DNS setup Retrieve DNS validation status Check DNS status