This SDK is for implementing SendGrid SMTP headers with C#. SendGrid SMTP API allows you to create specific handling instructions for an email - like: scheduling, categories, or filters. Code snippets and an example project are included in the documentation to help you get started.
Deciding what metrics matter depends on the overall strategy goals and business model that aligns with your APIs. This is why defining the business model was one of the first steps in your decision series. Now we need to make sure our evaluation framework matches back up to what we set out to do.
Email doesn't need postage, right? Is that old hoax about the postal service charging per message finally coming true? Not really. But PostageApp may be a service worth paying for if you want to send email from your application.