I try to use mailgun API. I looked at their documation and found some examples like this:
public static RestResponse SendSimpleMessage() {
RestClient client = new RestClient();
client.BaseUrl = "https://api.mailgun.net/v2";
client.Authenticator =
new HttpBasicAuthenticator("api",
"key-3ax6xnjp29jd6fds4gc373sgvjxteol0");
RestRequest request = new RestRequest();
request.AddParameter("domain",
"samples.mailgun.org", ParameterType.UrlSegment);
request.Resource = "{domain}/messages";
request.AddParameter("from", "Excited User <me@samples.mailgun.org>");
request.AddParameter("to", "bar@example.com");
request.AddParameter("to", "baz@example.com");
request.AddParameter(& ...
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