.NET

dotnet add package SendKit

using SendKit;

var client = new SendKitClient("sk_your_api_key");

var response = await client.Emails.SendAsync(new SendEmailParams
{
    From = "Your Name <you@yourdomain.com>",
    To = ["recipient@example.com"],
    Subject = "Hello from SendKit",
    Html = "<h1>Welcome!</h1><p>Your first email with SendKit.</p>"
});

Console.WriteLine($"Email sent: {response.Id}");