C#: Send a Mandrill Email From a .NET Website or Application

Mandrill is MailChimp's transactional email service. This code will allow you to send an email using Mandrill. You will need a Mandrill account, a Mandrill Outbound template, and an API key.

* Requires Newtonsoft JSON Nuget Package (or referenced dll).

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//url to send data to
string apiUrl = "https://mandrillapp.com/api/1.0/messages/send-template.json";

//account api key needed to send email
//created at: https://mandrillapp.com/settings
string mandrillKey = "my-secret-api-key";

//name of the email template created in mandrill
string mandrillTemplateId = "my-test-01";

//list of emails to send the email to
List<string> toEmails = new List<string>();
toEmails.Add("user@example.com");

//list of to names for emails above
List<string> toNames = new List<string>();
toNames.Add("Mr. Example");

//replacement values to add to the email
//these replacement tags must be added to your Mandrill tempalte: ex: <a href="*|site_url|*">Site Url</a>
List<KeyValuePair<string, string>> replacementValues = new List<KeyValuePair<string, string>>();
replacementValues.Add(new KeyValuePair<string, string>("site_url", "http://www.example.com"));

dynamic sendParams = new System.Dynamic.ExpandoObject();
sendParams.key = mandrillKey;
sendParams.template_name = mandrillTemplateId;
sendParams.template_content = new List<dynamic>();

sendParams.message = new System.Dynamic.ExpandoObject();
sendParams.message.to = new List<dynamic>();

//to emails
for (int x = 0; x < toEmails.Count; x++)
{
	sendParams.message.to.Add(new System.Dynamic.ExpandoObject());
	sendParams.message.to[x].email = toEmails[x];
}

//to names - in same order as to emails    
for (int x = 0; x < toNames.Count; x++)
{
	//dont add if email wasnt added
	if (toEmails.Count >= x + 1)
	{
		sendParams.message.to[x].name = toNames[x];
	}
}

//additional mandrill options
sendParams.message.track_opens = true;
//sendParams.message.track_clicks = true;

//create replacement values object to merge in
sendParams.message.global_merge_vars = new List<dynamic>();

int counter = 0;
foreach (var pair in replacementValues)
{
	sendParams.message.global_merge_vars.Add(new System.Dynamic.ExpandoObject());
	sendParams.message.global_merge_vars[counter].name = pair.Key;
	sendParams.message.global_merge_vars[counter].content = pair.Value;

	counter++;
}


//json send parameters
string jsonString = Newtonsoft.Json.JsonConvert.SerializeObject(sendParams);

//create web client to post data
var request = new System.Net.WebClient();

//set content type to json since we are posting json data
request.Headers[HttpRequestHeader.ContentType] = "application/json";

//post json data and get the response
string responseString = request.UploadString(apiUrl, jsonString);
		  
//read the results
bool success = false;

if (!string.IsNullOrWhiteSpace(responseString))
{
	dynamic resultObj = Newtonsoft.Json.JsonConvert.DeserializeObject(responseString);
	if (resultObj != null)
	{
		if (resultObj[0] != null)
		{
			if (resultObj[0].status == "sent")
			{
				success = true;
			}
		}
	}
}