.NET / C#

dotnet add package MailSetu

using MailSetu;

var client = new MailSetuClient(
    Environment.GetEnvironmentVariable("MAILSETU_API_KEY")!
);

var result = await client.Emails.SendAsync(new Dictionary<string, object?>
{
    ["from"] = "noreply@yourdomain.com",
    ["to"] = new[] { "user@example.com" },
    ["subject"] = "Welcome!",
    ["html"] = "<h1>Welcome!</h1><p>Thanks for signing up.</p>",
});

Console.WriteLine(result.GetProperty("id").GetString());

// Program.cs
builder.Services.AddSingleton<MailSetuClient>(sp =>
    new MailSetuClient(builder.Configuration["MailSetu:ApiKey"]!));

// appsettings.json
{
  "MailSetu": {
    "ApiKey": "ms_live_your_key_here"
  }
}