C# Sending Emails with the Mailgun API

< 1 min read

Sending email in C# via the Mailgun API is about 3x faster than via SMTP.

They make it very straightforward, just requiring a form-encoded POST with basic authentication.

	using (var httpClient = new HttpClient())
	{
	var authToken = Encoding.ASCII.GetBytes($"api:{_emailSettings.Value.ApiKey}");
	httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic", Convert.ToBase64String(authToken));

	var formContent = new FormUrlEncodedContent(new Dictionary<string, string> {
	{ "from", $"{_emailSettings.Value.DisplayName} <{_emailSettings.Value.From}>" },
	{ "h:Reply-To", $"{_emailSettings.Value.DisplayName} <{_emailSettings.Value.ReplyTo}>" },
	{ "to", email },
	{ "subject", subject },
	{ "text", txtMessage },
	{ "html", htmlMessage }
	});

	var result = await httpClient.PostAsync($"https://api.mailgun.net/v3/{_emailSettings.Value.EmailDomain}/messages", formContent);
	result.EnsureSuccessStatusCode();
	}

Let me know if you liked the post. It helps me create relevant content.

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Alexandru Puiu